Bought a valve spring compressor, pulled the valves out of one head and placed it in a tub to soak over the weekend. The valves are full of crud, will have to see if some brake cleaner will remove it.
The engine rebuild book calls for phosphate soap (dishwasher detergent) but the boat was written in 1987 and all companies now only make phosphate free soaps, so dawn dish soap it is. It takes grease off my hands fairly well. Worse case I am back where I started. Will update on in a couple days on how well it worked.
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