RE: heat exchanger
"I think the "stuff" on the exchanger is from salt water seepage around the end caps and the connection in the middle."
Agree , these gaskets do not seal over years due to the temperature changes and constant internal pressure most will weep.
A thin dowel is the accepted clean out tool, tho on extra plugged exchangers a long "bell hangars" drill bit , 18 inches long or so, will work well, just use care.
HAND turn the drill slowly .
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