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Have any of you cleaned something like this?

My best guess is that the white siding is fiberglass... The part I'm curious about are the black streaks.

I'll probably try a test spot next week. Maybe f13 ?
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Chris, Tony has a point since its runoff. You can try the f-13 but I've never been able to remove streaks like that 100%. And that's with brushing them.
I would let the person your bidding it for know that upfront.
 
apple said:
This one is important. Ive been working hard to get a call from them

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Then do a test spot with a brush. Try a roof wash with a brush to. Try straight 12% with a brush to if it still doesn't budge.
 
The siding looks metallic, you say its fiberglass? Ive cleaned something that looks like that, but it was metallic. Unrelated question, who do you have that insures you over 30ft?
 
JBurd said:
The siding looks metallic, you say its fiberglass? Ive cleaned something that looks like that, but it was metallic. Unrelated question, who do you have that insures you over 30ft?
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From my IPad it looks to be a metallic siding which we cleaned in the past. We used a gutter chemical to brush out those runoff marks on the metal siding.

I would do a sample somewhere there and try a couple of different cleaning chemicals with a brush to see if you can get those lines out. If it's fiberglass you could try a local Marina To see what they recommend to clean fiberglass boats. Or better yet do a search on your PC and see what chemical is the main one in cleaning fiberglass or plastics.

Let's us know how it works out for ya.
 
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