You mean Phil Wood's grease? Those guys know a little bit about making low RPM hubs filled with pawls work correctly. (Aside: I've built a couple bike wheels with Phil hubs. They are extremely high quality and smooth, and work better the longer they are used. Quality product.)
I use a very...
Buy a gallon of propwash from the local airfield. Works just as well anywhere on the boat.
There's no good one size fits all guide, as far as I know. Deal is, read, do youtube, cruise this forum, pay attention to what looks tired, leaky, creaky or broke on your boat, and keep notes...