Re: Accessing waste pipe
Before we went on our 4th July cruise-out, I had tried the vinegar and boiling water to dissolve the bronze/aluminum corrosion (and WD-40 and liquid wrench and PB blaster...). Didn't work. I ran across a guy with strong drill bits and he drilled a hole, then used some drill bit which threaded the hole and then I screwed in a 6 or 8" bolt, which gave me leverage when I banged on it sideways. Cap eventually loosened (it was just laying there, not threaded in place, or I would have had to drill it all out) and I bought a $2 rubber sink stopper and taped it over the hole for the trip. Am able to pump out, and to put in bleach, vinegar, whatever, to get it reasonably clean.
In between weekly races, trying to work up the courage to unclamp, untape, & sever the pipe from deck fitting and repot the deck and install the new fitting and new hose - which cost I doubt I can avoid.