My nephew was playing on some "jungle gym" type ladders made out of rubber tires. His clothes were damp and he has black streaks all over the front & back of them. I have tried everything I can think of to get them out, but they are not budging! You might know it is a favorite shirt and I would be one amazing Aunt if I could get it out. Just thought someone here might work at a tire company or service department that might have had the same stains on clothing that could help me out. Any thoughts are appreciated!