See a couple of light spots on this blue vinyl that can’t be more then 4 years old. Just want to make sure it is oxidation. It is kind of hard to see in pictures
You can always run your finger on the siding. If it’s chalky, it’s oxidation.
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Well, that is the exact method that I use so… CONGRATULATIONS!!! You are now “A Professional” lol
@Hotshot will present you with your prize 
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The siding is only four years old, it’s fine to wash…unless I’m missing something here.
Okay, I’ll offer some insight.
When you were taking these pictures, did you notice how the “light spots” coincide with exactly where the corners of the window frames are and exactly where the drains for the bottom sill are?
The light spots are drip marks from rain and condensation running down the window frame and dripping onto the vinyl siding below. Same with the bottom sill drain. Water running across a surface does what? Erodes. A la Grand Canyon. The water has eroded the UV coating on the vinyl allowing those specific areas to oxidize at a much faster rate.
You don’t notice it as much with the boring colors like tan, white, beige, etc. It’s more noticeable on darker colors but they all do it. Window frames typically oxidize much faster than vinyl siding and sometimes the draining water carries that oxidation down the surface of the wall as it runs off.
There. Thread railed…?
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I learn somthing new everytime I hop on here. It makes complete sense but not somthing I would have thought of on my own haha
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No problem. Pay close attention and you see them on a lot of houses.
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Might be awhile.
I think weekends are to @Hotshot what nights are to vampires–it’s the only time they go out.
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