Petrol and oil dispersant worked wonders on the RIBs off the standby boats. The downside was the pot scourers would scratch. This is ok on an. 8 year old tube with battle scars, but I would experiment with different pads before using it on a shiny rib.
The other thing is the standard thinners, that works as well. I would only do this outside and safely.
Both techniques did bring the tubes up like new, nowadays there are good products out there, but back in the day, anything could come in handy!!