I have a lot of stains on my concrete garage floor from oil leaks from my car and some grease. I've tried multiple times to get rid of them and now I can barely stand them. I've tried scrubbing them with a steel wire brush, but that does next to nothing and is just a waste of time and energy. Is there any quick trick to get these stains out of my garage floor? I don't want to spend more than 10-15 dollars on this though.
You can use cat litter as this works really well. Cat litter works good for cleaning oil spills, but also for cleaning many spots, especially greasy ones. Pour a small amount onto the spot and rub into the spot, pulverizing with your shoe. Sweep up when finished and maybe do it a second time.
If it's a greasy spot, pour fresh oil onto the spot first to dissolve and break it up, then use cat litter to take up the oil.
If a chemical is used, cat litter will help pick up what's left.
While not a quick fix, using muriatic acid to wash the concrete floor will get a lot of the surface stains. You may have to use it multiple times to get a really deep stain out. Then there are issues around handling an acid (safety, disposal, etc.). Also, if the surface of the concrete has been sealed, you will have to remove the seal before any cleaning agent will work.
Another option would be to paint the concrete. This will probably be outside the price range of $10 to $15.
Looking at some other solutions to this issue (I have not tried these):
Oven Cleaner: Get those unsightly grease, oil, and transmission fluid stains off your concrete driveway or garage floor. Spray them with oven cleaner. Let it settle for 5-10 minutes, then scrub with a stiff brush and rinse it off with your garden hose at its highest pressure. Severe stains may require a second application.
Soda: Here’s how to remove oil stains from concrete drive-ways and garage floors: Gather up a small bag of cat litter, a few cans of cola, a stiff bristle broom, bucket, laundry detergent, bleach, eye protection, and rubber gloves. Cover the stain with a thin layer of cat litter and brush it in. Sweep up the litter and pour cola to cover the area. Work the cola in with a bristle broom, and leave the cola for about twenty minutes. Mix 1/4 cup laundry detergent with 1/4 cup bleach in 1 gallon (3.7 liters) warm water and use it to mop up the mess.
WD-40: Did a leaky oil pan leave a big ugly spot in the middle of your concrete driveway? To get rid of an unsightly oil spot, just spray it with a generous amount of WD-40 and then hose it down with water.
You might try laundry detergent before some of the more aggressive methods. Some detergents are made for oily messes and if scrubbed in this could make the oil disassociate with the garage floor.
Mixing the Detergent with Baking Soda or salt can make a scouring solution that works on tough stains and even odours.
I used to work for a company that specialized in coating concrete surfaces, like parking garages, tennis courts, etc. Muriatic acid ( be very careful with it!) will etch the concrete so that paint will adhere, but the oil will actually keep the muriatic acid from reacting with the cement. You have to remove the oil first.
The way my dad taught me to do this would be to saturate the area with kerosene (cheap and readily available), scrub with a stiff nylon brush, then spray off using a garden hose with a nozzle to increase water pressure. Then you repeat because it never all comes off the first time.
We did occasionally use muriatic acid for this as a last resort on extreme stains, but it requires a great deal of care. Because it is an acid, you need to be careful about splashing yourself and breathing it, the hands-and-knees work is limited, but also it will not just clean concrete, it can dissolve it too if left on too long. A safer acid to try would be phosphoric acid, less strong but a whole lot safer.
Another cheap and useful cleaner would be tri-sodium phosphate. Tri-sodium phosphate is a crystalline cleanser similar to soap. It will break down oils so it is useful for both dissolving the grease stain and also for dissolving other oil-based chemicals you have applied (like the kerosene).