Guys I just dropped a microfiber towel in the ground and it catched a lot of little rocks, I just washed it with the other 20 dirty microfiber in the wash machine but I am afraid that I don't know if there are still little rocks in one of the microfiber towels that I don't see and can scratch the paint? What should I do? Can I still use them in the paint if I put them in the wash machine or did I just ruined 20 towels?? 
