White siding that has yellowed.
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vinyl or aluminum?
My old neighbor showed us a trick for siding. Ours is a very light brown and other than the north side which every year I clean to remove the green stuff that grows I thought it looked good. My neighbor brought over a bottle of Totally Awesome- found at our local Dollar General store. He sprayed directly on and rubbed with a microfiber cloth and what a difference! It had a layer of white/ yellow stuff on it that I am assuming is an accumulation of pollen and dust. Totally brightened the whole house. I don't know if it will help your yellowing problem but for $1 it is worth a try!
https://joneakes.com/jons-fixit-database/1704-How-to-clean-aluminium-and-vinyl-siding
https://www.bobvila.com/articles/how-to-clean-vinyl-siding/#.Wc-tl2j9RPY
http://www.inspectionnews.net/home_inspection/building-envelope-home-inspection-and-commercial-inspection/32357-yellow-stains-white-vinyl-siding.html
https://www.vinylsiding.org/vsi-resources/cleaning-and-maintenance/
https://www.certainteed.com/resources/801.pdf
for vinyl in general:
http://www.howtocleanstuff.net/how-to-whiten-yellowed-vinyl/
https://www.roofpedia.com/how-to-clean-vinyl-siding/
https://www.hunker.com/12595470/oxiclean-and-siding
http://www.doityourself.com/stry/4-types-of-cleaning-solution-for-vinyl-siding
Jomax from Lowes does wonders. A professional cleaner used it following directions on jug with water pressure machine. The siding looked new when he was done.He said we could do it ourselves, but at 74, we let him do it. You can rent the machine.