I have googled around some harley forums on the topic of belt dreesing , and even the official harley product receives very mixed reviews / results.
The impression I got was the majority view was simply try to keep it clean ( i.e. no belt dressing ) - I know this is almost impossible on a M3W , and dont use what seem logical solutions like silicon as dirt clings to them making things worse , and dont use anything that could degrade the belt material. In other words there is no magic solution.
This is why I have been toying with a belt cover of some description , no progress yet.
