One word: Teak-a
This stuff is amazing, on my Scarab I used to sand down the platform every year, which over the course of like 10-12 years makes the platform thinner. Was recommended Teak-a by Ski Masters Watersports here in Seattle for my Epic platform and it works so well! Basically, 2 steps with an optional 3rd. 1st step is lifting the gunk that builds up, 2nd removes it all, and finally you can coat the teak with a quaility teak oil. I just did the last step last summer, and my platform had never looked better.