seat belt cleaning

I clean cars for a living , almost 25 years now this is how i clean any thing that is stained bad or hardened from years of wraped up under seats, you get a stain on a cloth seat or carpet keep varsol in a spray bottle spray it on and wipe off , use another cleaner to take away the smell.Also try it on tar sometime you will not use anything else again to take tar off. Thanks Rick L.