I have a 2000 H320 that I am trying to keep in showroom condition while still sailing the heck out of it. I have run across a problem with dirt sticking to the liner in the cabin. I am referring to the smooth liner that makes up the settees, engine cover, etc NOT the fabric liner overhead. I guess it's made out of smoothly finished fiberglass. Anything that touches the liner stays there forever unless IMMEDIATELY wiped off. For instance, a mechanic left a dusty (not grease - just dust) footprint on the liner when he was bracing himself to do something or other. He's in bad luck if he robs a bank because I still have a perfect imprint of his boot for the cops to match up to his footprints! I have tried water, Fantastic, detergent, wiping, scrubbing - you name it! Nothing even makes a dent. It's as if the dirt has been absorbed right into the material. One last clue: I stomped a spider last year (very satisfying!) against the engine compartment. He is STILL there! I mean the whole squashed body! I've even tried a toothbrush. He has very clean teeth now but otherwise it had no effect. Any suggesitons on a cleaner that can get down into this mystery material without bleaching it out? Also, any ideas for sealing it to prevent dingy build up in the future? Thanks