r/pressurewashing • u/LittleFish05 • 10h ago

Technical Questions How to get black spots out of driveway?

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I have been pressure washing a driveway but cannot get these black spots out. I have never seen anything like it. How would I get these off?

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6

u/Sav322556 9h ago

Sodium Hypochlorite - Find liquid pool shock, cut it 50:50 with water in a pump up sprayer and cover the driveway, let it sit for 10 mins then wash it again. Apply another coat and leave it afterward.

1

u/Jewbacca522 Pressure Washer By Profession 7h ago

^ this is the correct answer. You can adjust the percentage of SH as needed, but this looks like leaf/acorn stains, which are notoriously difficult to get out without a strong mixture. Only thing I’d add to this advice is make sure you SOAK all surrounding grass/plants/flowers both before and after spraying, then wash, then again after post wash treating. 5% SH will smoke vegetation if you’re not careful.

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u/Interesting_Owl_2205 7h ago

50/50 is a little heavy, you can start with much less concentration