The only thing the NH DES is going to approve is lake water. Biodegradable soap is not allowed. You can't wash a boat in the lake like you wash a car, no bucket of sudsy water and a sponge.
I suggest a spray cleaner like simple green, or even something stronger. Spray a little on a rag and clean up the dirt, and wipe it dry, none needs to get in the lake. Follow-up with a good cleaner style boat wax, again nothing in the lake. Be careful near the waterline usually just water and a stiff brush is enough.
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