Would never use an abrasive on hypalon, pad or cleaner. I`ve used the 'selclen s' for over 15 years in the commercial cleaning industry, and wouldnt use anything else. Its very safe, and easy to use. Its also comparativly cheap (compared to specialist rib cleaning products) You simply spray the whole boat , then power wash off! (dont work for selden, just use their products)
Politicians, like nappies, have to be changed frequently - and for the very same reason.