Unless you are using a very high pressure hose like a commercial one or very expensive one, I can tell you from experience with a 2300 psi washer you will just make a big mess and remove little foam. The best tool for me was a long hand saw right down along the edge of the tank. You need to break that bond and don't necessarily need to remove all the foam initially.
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Old School
1985 V20 cuddy, 1999 Johnson 115 Armstrong Bracket
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