C.M.
I made the mistake of throwing a paint rag in the hamper with some towels. It was also soaked in Goof Off!
I second the Dawn recommendation! I got a big bucket and some hot water and soaked the towels in Dawn. I had to dump out the bucket, wring out the towels and soak them in more Dawn a few times.
I finished out by washing the towels in regular detergent in the washing machine and doing a vinegar rinse. The smell came out just fine!
Good luck!