I've used very mild soapy water with a washcloth or brush if the tolex is really wrinkly. Works fine. To get it looking like-new, hit it with some Armor All like it's a dashboard in a 1976 Cordoba. I bought a cab last year that while being in great shape, it was dirty and dusty as hell. I gave it a good good scrub down and shined it up with armor all and it now looks brand new.