Yup! That's the way most of them look after 30-40 years or even worse!
Notice the fins on the hydro are not painted??
There is a reason for that you know!!
Good luck with the cleanup.
I have used mineral spirits in a spray bottle and a parts cleaning brush w/good results while on the bench, that is after most of the bug chunks are removed.
Put a drain pan underneath on some cardboard to lessen the mess.
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