Talking about tough clean-ups: I've got to get crude oil off my kayak and a paddle blade. There are natural seeps in Santa Monica Bay.

After playing with a 6' thresher shark ( trailing fishing tackle), actually I shot some video and he circled me and he played with me, rapping my rudder once. When he circled me the second time-- clearly sizing me up--I moved my paddle so were he to do something quick he'd be biting into my second best paddle instead of my hand holding my video camera.
Coming on some oily areas, I decided to get some closer shots of the globs, some of which glommed onto my hull. Try coating that stuff with vegetable oil.