As an FYI... I saw this on another forum and felt the urge to share.
I am sort of fixing up our older hypalon dinghy for the season (even tough, thanks to JD, we have a nearly new Livingston 9V). I have pulled off the rub rail that was only half attached, used a air dye grinder with a Scotch Bright scrub pad to take off all the old glue. THEN, as someone on BoaterEd suggested, used Orange GoJo hand cleaner with the scrub side of a kitchen sponge to clean the hypalon to a nearly new condition. It works quite well.
Once the threat of rain passes, I'm going to spray it with 303 and paint the transom.
I was trying to decide about a rub rail. The parts from inflatableboatparts.com would be about $200, but there is a guy at Minnosott Beach, NC that would do the entire job for less than that (since I have done all the hard work already), so I need to decide if it's worth it or if I'll just leave the rubrail off for a while.
The more you know! :-D