Not sure what this stain is?


So I’ve ran into this stain on siding two times now in my years of washing and have tried regular hw mix, tried brushing. And nothing. It’s not algae and it’s not dirt. So I’m stumped, any ideas? Thanks

Fallout. It’s greasy/sooty? I’ve run into it a couple times. Barkeeper’s friend and magic earaser.

Thanks man! I will give it a try. That’s a good idea.

I’ve run into something like this as well. Two times so far I’ve seen it on white vinyl siding and it’s always at the top of a house and refuses to come off.

Yeah it’s really weird.

It’s usually where some yahoo has cleaned it and shot too much pressure up under siding by standing too close. The it runs out and dries and over a period of years it’s like frigging concrete. I ran into it the other day and tried a bunch of stuff, including scrubbing but the only thing that really worked pretty easily was put a light acid mix on it. Took a couple of applications.

Gotcha. Yeah I’ve only seen it on two houses before. Same I tried scrubbing it and was Not budging. I’ll try the bar keepers friend and your suggestion next time. Thanks guys.