I have an older Sea Nymph boat, an aluminum boat with a wood transom. Over
the years, the transom has received a lot of gas and oil. I think this may
have even been good as a preservative. The outside is skinned with
aluminum, the inside is open wood.

What would be a good way to clean this without agressively attacking it and
degrading the wood? I was thinking of spraying a degreaser, followed by
power washing at a distance of about 18" with a wide tip. Do this a couple
of times, maybe use Mean Green, or just Dawn dishwashing liquid, or even
Gunk. Just don't let it sit too long, then don't overblast it with a power
washer.

Then what? Varathane? Boiled linseed oil? I heard of a mix of linseed
oil, mineral spirits, and varnish. I want it to look nice, and realize at
this age, I can't expect full restoration.

Anyone have any ideas?

Steve