Dirty hull and prop

[Quench]

We lose about 2-3mph at 2K rpms over about 6-8 weeks in the water without a cleaning. We lose probably twice as much off the top end. And we, along with others in the marina, have some concerns about the quality of the dive service.

I can't do much about the hull personally, but I could probably clean off the prop myself. What do you think makes the bigger difference - clean prop or hull?

[Norseman]

I am guessing the prop..