I'm no rocket doctor, but maybe this is one of those times you shoulda spent the rest of the day rinsing dawn out. I was joking above but the way elemonator rinses is like a dream come true. This really does look like dawn pulled the bleach into the nooks and crannies. Capillary effect and ran out when your back was turned.
Sun. Dawn. Strong SH. Molotov cocktail man.
It's probably time to call your insurance guy or cover the cost of the siding. Sucks, but if you've tried all the methods and it's not budging...
From my limited window cleaning experience, I've used 0000 steel wool to take haze and water spots off glass without scratching it as well as clean up funky vinyl frames without damage. If you're gonna have to replace it anyway might be worth a shot?