GP66 vs Simple Green: What’s The Difference?

Based on my tests, GP66 is the clear winner when you need heavy-duty industrial cleaning power to remove years of built up grease and oil. The high pH formula lives up to its cleaning hype. But for general purpose cleaning at home, Simple Green holds its own with its versatility and safety if you follow precautions.

GP66 vs Simple Green

GP66 vs Simple Green: Specs & Uses

🧪Active Ingredients

GP66: Sodium metasilicate, Sodium carbonate

Simple Green: 2-Butoxyethanol, C9-C11 Alcohol ethoxylate, Trisodium citrate, Tetrapotassium pyrophosphate


GP66: Clear

Simple Green: Colored, contains dye

🛠️Common Uses

GP66 can be used to clean concrete stains on countertops, linoleum floors, and bathrooms; clean fiberglass showers and tubs; and remove grease from gas stove grates.

Simple Green is capable of tackling oil and grease; safe for fiberglass/Acrylic garden tubs; cleaning limestone fireplaces; rinse thoroughly and use a brush for carbon or soot buildup.

Technical Info

GP66Simple Green
DatasheetN/A📥Simple Green All-Purpose Cleaner
pHAlkaline, pH 12-138.5 to 9.5
BiodegradabilityReadily biodegradablemeet the Organization for Economic Cooperation and Development’s (OECD) requirements for biodegradability
FragranceNoneContains fragrance with limonene
Packaging Size1 gal, 5 gal, 55 gal500 ml, 1 L
Regulatory ClassificationNon-hazardousNot classified as hazardous

My Hands-on Test: GP66

Unlike water and other detergents that sit on top of surfaces, GP66 breaks the water’s surface tension so grime doesn’t stand a chance. The result is cleaning power that obliterates dirt in a way no other cleaner can match.


GP66 has even been lab tested and approved by the NSF for its cleaning performance. And it achieves these results without any animal testing.

GP66 is powerful
GP66 is powerful

Cleans a Wide Range of Surfaces

First and foremost, GP66 cleans a wide range of surfaces impressively well. I often dilute it to make it last longer, especially for tasks that don’t require excessive cleaning power. To my surprise, this cleaner has successfully tackled glass, dirty stovetops, sinks, bathtubs, floors, engine compartments, rims, tires, dishes, walls, and even clothing stains like a white shirt stained with kool-aid. It truly is a miracle cleaner that has simplified my cleaning routine by replacing several other products.


Another one of the standout features of GP66 is its versatility. It excels in handling organic messes, degreasing tasks, and even tackling pet stains. I’ve even used it on pots and pans, particularly those non-stick pans that aren’t dishwasher-safe. GP66 does an exceptional job at restoring their cleanliness.

GP66 explained

Blood Stains

Allow me to share a couple of remarkable experiences I’ve had with GP66. One day, my 10-year-old son had a minor nosebleed at school, and unfortunately, some blood got on his favorite sweatshirt. Unaware of the stain, we washed and dried it before noticing the blood stains. Thankfully, GP66 came to the rescue and completely removed the blood stains, even after the sweatshirt had been through the dryer. I was truly amazed.


Another impressive feat of GP66 is its effectiveness in the bathroom emoticon - bathroom tiles and grout. As we all know, kids and toilets don’t always make the best combination. However, with GP66, I’ve witnessed stains breaking up effortlessly as I spray it on.

Coffee Stains

Coffee stains can be quite stubborn, especially in coffee pots or on plastic pieces in espresso machines. However, GP66 works like magic, effortlessly breaking up the coffee stains and leaving surfaces clean and stain-free.


While GP66 has numerous positive qualities, I do have one small request. I wish they offered a scented version of the gallon concentrate. Although GP66 has very little odor, when I use it to clean a warm oven, the smell becomes more concentrated. The same goes for when I spray a lot of it to clean the shower and tub. It would be great to have a more pleasant scent option available, but overall, it’s not a major issue.



Q: Can GP66 effectively remove stains from concrete kitchen counter tops?

A: While I haven’t personally tested it on concrete, it has proven to be highly effective in removing stains from various counter tops. It has also shown great results on linoleum floors and in bathrooms.

Q: Is it suitable for cleaning granite and stainless steel appliances?

A: I’ve been using GP66 and Krud Kutter KK326 Original Concentrated CleanerKrud Kutter (krud kutter vs goo gone) for tough cleanups and as a degreaser for over a year now. It seems to work well and is safe to use on all the surfaces in my home, including granite and stainless steel appliances.

Q: Will GP66 effectively clean fiberglass showers and tubs?

A: Absolutely! I personally use GP66 to clean my own fiberglass shower and tub. It has proven to be highly effective in removing dirt and grime. You can trust GP66 to clean just about anything!

Q: Will GP66 effectively clean gas stove iron grates?

A: Yes, it works wonders on grates! In fact, GP66 is capable of removing grease from almost ANYTHING! I’m truly amazed by its performance and was actually considering purchasing more.

Q: Is the 36 oz. bottle of GP66 miracle cleaner ready to use, or do I need to dilute it?

A: We offer a ready-to-use 32 oz. bottle of GP66! It’s fully concentrated and can be used on over 1,000 different surfaces, effectively removing tough dirt, grease, and grime. However, when using it on paint and varnish, make sure to dilute 2 oz. of GP66 with 30 oz. of water. The same concentration applies to the gallon bottle.

Q: Can the gallon bottle be used in its concentrated form for general cleaning of showers, sinks, stoves, etc., or should it be diluted?

A: For stubborn stains, you can use the product at full strength. However, in most cases, I dilute GP66 and find that it still gets the job done effectively.

Q: Does GP66 effectively clean efflorescence?

A: When swished with water, it does create a slight amount of suds. Personally, I prefer using it without water (except for rinsing) and have been extremely satisfied with the results.

CTA:list all comments

4 reviews

    • Yes, you can safely use GP66 on your granite counter tops. If you're doing general cleaning, simply dilute it by mixing 4 oz. of GP66 with 28 oz. of water. For tougher grease or grime, use it at full strength. Allow the solution to sit for a few minutes, then wipe it off with a microfiber rag. Thank you for…Read More

    • I've personally used it after running the oven on auto clean mode. Once the ashes were wiped out, I sprayed GP66 and wiped it dry. Then, I preheated the oven to 350 degrees Fahrenheit and used it to bake. I experienced no issues or unpleasant odors.

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My Hands-on Test: Simple Green All-Purpose Cleaner

Simple Green AllPurpose Cleaner
If you’re in search of a reliable, all-purpose cleaner that truly delivers on its promise, the Simple Green Original All-Purpose Cleaner is an absolute must-have. It simplifies the cleaning process and leaves your living spaces spotless and fresh.

✅Pros: Simple Green All-Purpose Cleaner

What sets this cleaner apart is its unmatched versatility.

First time to use Simple Green All-Purpose Cleaner
First time using Simple Green All-Purpose Cleaner concentrate.


Whether it’s kitchen countertops or bathroom surfaces, it tackles dirt and grime effortlessly. I appreciate that it’s tough on stains yet gentle enough for various materials. Plus, knowing that it’s non-toxic adds an extra layer of reassurance for everyday use.

Delightful Smell

First off, the smell is absolutely delightful. I use it to clean the white surfaces on my boat, and it works like a charm. It’s as if it was specially designed for that purpose. It lives up to its promise and does wonders without any issues. Talk about great value for the money!

Simple Green All-Purpose Cleaner Explained


Another area where this cleaner shines is in its safety. It’s safe for both you and the environment, which is a huge plus in my book. Furthermore, its versatility is unparalleled. It works on nearly everything, and the results are impressive. From my vinyl fence covered in green and black mold to my smoke-stained ceiling and walls, this product works wonders.

Clean the Seats of My Car

I even used it to clean the seats of my car, and let me tell you, it performed miracles. My car hadn’t had a deep clean in about three years, and this cleaner took the dirt right off. I highly recommend it for automotive cleaning needs.

❌Cons: Simple Green All-Purpose Cleaner

While I personally love the scent, I understand that scent preferences can vary. Some may not enjoy it as much, but rest assured, the cleaning power is not compromised.

Simple Green AllPurpose Cleaner

FAQ: Simple Green All-Purpose Cleaner

Q: Can Simple Green be utilized to effectively clean and degrease an automobile engine compartment?

A: Are you referring to the engine compartment of a car or the engine bay in a garage? While I haven’t personally used it for either, it should be effective for certain applications. Although I cannot guarantee its performance, its concentrated formula may work well with a pressure washer.

Q: Is Simple Green classified as a non-ionic detergent and biocidal cleaner?

A: Yes, it is.

Q: Can Simple Green effectively tackle oil and grease?

A: Absolutely. However, for heavy oil and grease, I would recommend using it without dilution and applying it multiple times.

Q: Is it safe to use Simple Green on fiberglass or acrylic garden tubs?

A: Yes, it is safe to use on fiberglass or acrylic garden tubs.

Q: Is Simple Green suitable for cleaning vinyl siding?

A: I haven’t personally used it on vinyl siding, but I would suggest giving it a try. It has worked wonders on everything I have used it on. It is the best all-around cleaner I have ever used!

Q: Does Simple Green have antibacterial properties?

A: No, Simple Green All-Purpose Cleaner is a non-toxic cleaner and does not possess the ability to kill bacteria or viruses. It is not registered with the EPA as a disinfectant.

Q: Can Simple Green effectively remove spots from carpets?

A: To the best of my knowledge, it is not specifically designed for spot removal on carpets. While it is a good cleaner, it may be too harsh for carpeting, so consider Citra Solv Citra Solv Natural Cleaner & Degreaserinstead.

Q: Can I use Simple Green to clean my limestone fireplace?

A: Yes, Simple Green All-Purpose Cleaner can be used to clean a limestone fireplace. However, ensure thorough rinsing after applying the cleaning solution, and cover surrounding areas to prevent overspray. You may need to use a brush to remove any carbon or soot buildup.

Q: Is Simple Green ready to use straight from the bottle, or does it need to be diluted for use on marble and granite?

A: Simple Green is a concentrated cleaner. The recommended dilution for marble is 30:1, and for general purposes, it is 10:1. However, I find it hard to imagine that using it at full strength would harm marble. You can find a comprehensive dilution chart for various substances on the Simple Green website when you search for “Simple Green dilution.”