Awesome cleaner from the Dollar Store. Comes in a spray bottle and removes dirt other things won't touch.
That IS what it is called AWESOME. It is one dollar for the spray bottle or one bigger bottle that is a refill. It is an all purpose cleaner and degreaser that works like no other cleaner on the market.
Check out a majic eraser like Mr. Clean.
I have tried this it helped a bit ...but the black stains remain.
Did you know that you can spray the power washer right through the screens and onto the windows? We use a power washer on the outside of the sills and onto the siding etc. OF COURSE make sure the windows are closed!!! HA. AHH that would be a mess. But it does an amazing job cleaning your outdoor sills and screens. Happy Spring cleaning!
If you are unsure how to rent a power washer. Check out my post: https://karupp-did.net/power-washer/