Has anyone every heard " If something sounds too good to be true, it usually is?
Though Chemicals play a part in removing oil, one cannot make an intelligent decision that a miracle will happen if you use one.
I have been cleaning nothing but Parking Garages for over 26 years. When it comes to a petroleum base product ( Motor Oil ) I know how to remove them. I do not know of any contractor who sell's chemicals will ever go to a parking facility, pour some chemical and wash it down with a Kmart Plastic Water gun on a oil stain. An oil stain that is old and that has set for years or even months. They won't...why...because it will not remove the penetrated stain. Now I have seen those who use chemicals in a gas station. A gas station that they clean weekly or bi weekly and get dirty fast. But that oil has not penetrated into the concrete, so sure, throwing ANY chemicals down that is designed for oil removal, will work...even with cold water....something is better than nothing... So don't be fooled.
The best chemicals I found are usually those that are not advertised on these BBS and are usually cheaper then what is advertised. For example, one chemicals I used cost $45 for 5 gallon bucket. The manufacture says dilute 10 to 1, but I use it full strength. I show this video ONLY at the Parking Garage Cleaning Event held this March in Dallas Tx. Now do I post my chemical on these BBS for my competitors to know, NO I do not. I want to keep my advantage over my competitors
For years I laughed at some competitors who used advertised all purpose products at 50 dollars a gallon for oil removal. Those contractors went out of business. So do not expect anyone to post their chemicals that are cheap to use, but works as good or better then those contractors who push their retail product.
Again, anyone can remove a spill that is recent. Dawn soap with luke warm water or even some soda like Coke will work just fine for that...why you ask? because the oil has not set into the concrete. The oil is settling on top of the concrete. But once it penetrates into the concrete, you need some kind of reaction to pull that stain out.
I have used chemicals listed above at FULL Strength as recommended by those who manufacture it and have a video showing their effectiveness when it comes to oil stains INSIDE a Parking Facility. I do not sell products to make a buck or push a product for a kick back.