Just starting my business and have been reading through these forums…great resource.
So here is my situation. tons of mold on fairly new white vinyl siding. I used xjet with the 9/1 proportioner in 12.5% SH. the mold was removed but required a 2 coats and in some spots a little bit of pressure. Now i notice the siding has some whiter spots than others and am not sure exactly what this is. Looking for some experienced input.
I had unusual stripping on a house and started to see a pattern to it figured out that that is the same layout has the framing showing through. Yours looks like you did not rinse the Sh real good or left on too long…
I thought it may have just needed rinsing so I washed again with SH and gave a very thorough rinsing and the marks came back. I am thinking this is just oxidation marks as quite a bit of the siding was blocked from the sun for several years. Does that make sense?
Thanks again to all the responses and everyone sharing their knowledge.
In my experience, oxidation isn’t so much a big thing on sides that are that green. Now the sides that are in full sun are typically chalky with oxidation.
Depending on how large that side of the home is, I’d offer to brush it with a soft bristled brush on a pole while a HW mix is dwelling, then rise it all off. That lets you feel goof about leaving good looking results and the customer will know you take pride in your work.
Is the second pic the “before”? If so, looks like lichen to me. I’m new to this myself but see how this growth could cause inconsistent oxidation and/or “staining”. After a basic house wash i would consider any other efforts to deal with this as a restoration service and price accordingly.