We, along with many in eastern PA, had a huge number of stink bugs this past year. I have had to clean up quite a bit of stink bug poo inside the house. But the siding on either side of the front door was the worst.
Our siding is old aluminum which has been painted. Warm water with detergent and a scrub brush wasn't enough; I needed to add a little bleach as well. Even then, if you look closely, you can still see the marks.
But overall the porch, and while I was at it I washed the rest of the front of the house, looks so much better. Now I will feel better about putting up Christmas decorations.
We've been discussing what type/color of siding to put on the house. Is there a color called "Stink bug poo brown"?????