Shoes and Tar tips please?!?

Nicah • Scarlett Drew, March 18th 2017💕
So my husband roofs and has switched jobs for seasonal work. He has these boots that are expensive as hell and little to my knowledge he wore them while roofing with tar 🙄 any idea of how to get the tar off. Someone told me gasoline but that's going to ruin the boots. Any other help??