How clean do I make the garage floor before applying concrete paint.

Clean up any oil stains and make sure there is no dust on the surface. The concrete paint should will have the preparation instructions on the label.

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.

Soda (Coca Cola). 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.

Oven Cleaner. Get those unsightly grease, oil, and transmission fluid stains off your concrete driveway or garage floor. Spray them with Easy Off No Fume Oven Cleaner in the BLUE can. 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.

Kool-Aid. Nasty rust stains on your concrete? Mix unsweetened lemonade Kool-Aid with hot water. Scrub and the rust stain should come right out.

Baking Soda. Salt and commercial ice-melt formulations can stain — or actually eat away — the concrete around your house. For an effective, but completely innocuous, way to melt the ice on your steps and walkways during those cold winter months, try sprinkling them with generous amounts of baking soda. Add some sand for improved traction.

Ammonia. Tired of those annoying discolorations on your concrete work? To get rid of them, scrub with 1 cup ammonia diluted in 1 gallon (3.7 liters) water. Hose it down well when you’re done.

My mum used to keep our concrete driveway free of oil stains by sprinkling powdered Tide laundry detergent on it then adding a little water to make a paste and scrubbing it with a straw broom then letting it dry. Once the detergent dries it soaks up all the oil. You can scrape off the bulk of it then wash off the rest. Give your floor a dousing of lemon juice to break down any last bits of remaining oil and repeat the Tide detergent process. Prepping a floor for painting is a bit different from just getting it clean. Hence the lemon juice and second application of Tide. I've tried using other powder detergents and they never work as well as Tide. Makes you wonder what it does to your clothes huh? lol

As clean as you can and Dust free.....