I have a chimney that the flashing rusted on and stained my shingles. I have ashpalt shingles, light gray, and the rust is noticable. I tried CLR (Calcium, Lime, Rust remover) with a brush (first diluted, then a full strength-but I was worried about corrosion), but so far am unable to get the rust off.
Does anyone have any suggestions??? I really dont want to replace the shingles, as there is not damage, only discolor.