Hello, here's a video that gives advice/suggestions about how to prepare the cement.
Here are ways of cleaning concrete. I would assume they would work great before painting.
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.
Here are what other Hometalkers did
pressure washing is the easiest and best method
Here's what we did: https://www.exquisitelyunremarkable.com/2018/08/how-to-paint-concrete-patio-makeover.html
We pressure wash our cement side walks and steps every year. Best method we've found so far.
Hi! I would pressure wash first. Good luck!
Pressure wash and use an etching concrete cleaner to prep for paint.
We used a pressure washer on our concrete driveway.
First I would pressure wash to get any loose off then follow steps in this site
If it is ourdoor or in your garage, I'd use a water pressure washer.
You don't need a pressure washer if you don't have one. Just scrub it with dish detergent and a stiff brush or broom and rinse well.
It kind of depends on the location -- is it indoors or outside like a patio? Outside you can pressure wash.
Hello, Clean the concrete surface with soap and warm water, removing any old paint. First, sweep away any surface leaves, debris, and dirt. Then remove any existing paint or gunk using a power washer or scraper and wire brush. Scrub away any dirt, grime, or gunk that is stuck to the concrete.
Here is a video tutorial to guide you into preparing your cement for painting.https://www.youtube.com/watch?v=DZTB49SJ6qY
Here's a post that might help https://www.bradthepainter.com/how-to-prepare-concrete-for-painting-or-staining/
Here's a really comprehensive guide you ca follow https://www.doityourself.com/stry/how-to-paint-concrete-that-has-already-been-painted
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