Here’s the latest reader question, along with my reply!
Lynn asks: My concrete drive is darkened with moldy dark residue. When a vehicle parks there and after it leaves there is a very large circle that is left very clean. I can’t scrub the concrete nor can I pressure wash it and get as clean. Why? What is in the dripping liquid? I want to buy that so I can clean my drive. Hope you are able to solve this mystery.
My reply: I wish I had some pictures to go by! The clean area you describe is probably caused by the heat of the car’s undercarriage killing off the mold or just drying the concrete enough that it looks clear for awhile. There are specific anti-mold/concrete cleaning products you can buy at places like Lowes and Home Depot. I’ve used bleach successfully. Kitty Litter is also excellent at mopping up oil and such spilled on the concrete – which is porous and so the stains tend to “set.”
I’d try cleaning the driveway with bleach or a similar product, then allow it to dry thoroughly and apply a sealant (or even paint) if you’d like to keep it looking sharp.
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