How to sanitize interior after long-term rodent intrusion?

This may be deeper than you think. Mice urine is very dangerous. You might need to have these seats reupholstered. If you don't want to put much money into it, I understand. You can even do it yourself.
I know j par has done a homemade job on his roof. His turned out looking like crap, but at least it wasn't mice crap. Maybe he'll chime in with some suggestions, especially since he is working on about the same type of project right now, that '74 truck.