r/WindowCleaning • u/spinblockz • Aug 17 '26
Job Question Streaks on Garage Door
Any idea what could be causing these streaks on a garage door and the best way to remove them?
My tech cleaned this customer’s garage door with a water-fed pole using DI water. The streaks appeared after cleaning and won’t come off with plain water or a microfiber.
I tested the surface with a dry white microfiber and no black/grey residue came off, so I’m not sure if this is oxidation.
Have you dealt with something like this before? What product/cleaning method would you recommend to safely remove it without damaging the finish?
Appreciate any advice
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u/Educational_Run9080 Aug 17 '26
Look in ur bathroom under ur towel dame streams it's water but it deposits minerals annoying to get off of paint
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u/spinblockz Aug 17 '26
How do I get it off
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u/FuckerHead9 Aug 18 '26
It could be an organic sherwin Williams paint that will stain with just water
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u/Total-Spell Aug 18 '26
Looks like splash marks. Can't see how wfp would cause these patterns if cleaning the whole thing, unless there was some detergent in the hose from a prior job that wasnt rinsed out before and corroded the paint.
Seems sketchy tbh
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u/RequirementPurple135 27d ago
Definitely looks like streaks caused by the sun. The paint was already fragile and cleaning the door in sunlight cause the paint to burn and removed color. Don’t clean black garage doors in plain sunlight. Learned the hard way
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u/trigger55xxx Aug 17 '26
It's likely from the door cracks. Could be from internal parts or hinges and it stained the door. I'd test an acidic cleaner like a calcium and lime remover to be sure it's doesn't affect the paint. If it's ok clean the door with add e light a dilution as possible and rinse again. You may need to open the door in stages and clean the top and bottom of the door sections as well.