2 years of grease staining concrete

So here’s the pictures and situation, looking for everyone’s 2 cents of wisdom!

This restaurant has their property Managment group breathing down their necks since they cart out their grease/oil to a grease disposal area and spill the stuff every now and then.

So, here comes Mr Manager wanting me to clean and get rid of the 2 years of stains in the concrete.

I plan on using Purple Power degreaser, applying it with a roller brush and keeping it wet for anywhere between 10-15 minutes then taking my surface cleaner to town on it. (Just using a small 3300 pressure washer)

I plan on taking two days on it. First one to clean his outdoor patio area but then going and testing an area where the grease staining is bad. If it works great, if not then let the sweat bullets commence.

Do y’all suggest anything different or maybe more extreme in the mixing department?

Also, when I do the spray off…where do you normally spray it off towards? The grass? The street drain? I feel like if I don’t spray it off somewhere then I’m just creating more work for me.

Thanks for your time and energy on this!










Oh man you’re gonna want to rent a hot water unit for that.

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Wearing safety glasses and gloves, use warm water from the restaurant to mix sodium hydroxide (lye) in a pump sprayer or your mix tank. I think I used 1 cup to 2 gallons but double check your ratios. Spray directly on the stains, rinse before it dries. Surface cleaner on the whole area after.
https://www.dudadiesel.com/choose_item.php?id=50drhdl&gclid=Cj0KCQjw5PGFBhC2ARIsAIFIMNfHWoN-q4B2MMR7YO8QIyn0BassmZlqP7YXRN-O5nqgj3LcKnwmaAcaAtszEALw_wcB

This is the stuff hood and grease trap cleaners use.

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When I do these I also bleach after its done. There will still be some shadowing after. Take it easy on the blue painted stuff.

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Ha yes, I wanted to test it out before having to rent one. I’m in my second year and I’m saving up for a professional truck build with a heated washer.

But yes, I’m thinking I’ll have to use heated

Heat and sodium hydroxide

Potassium hydroxide would be better to use or even mixing some with sodium hydroxide. Potassium hydroxide breaks down animal fats better than sodium hydroxide does per our forum chemist

You may need f9 Groundskeeper after you get the topical grease.

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What was the end result for this? I’m in a similar situation with staining that may be worse. What worked for you?

You’ll likely never remove all of the grease stain from concrete if it’s an old stain. There’s usually a shadow left over.

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