Clothespins and add some water to the bulge then add some Raritan CP bowl cleaner let stand for a couple of days. Leave all bedding and cushions out of the boat until the clothespins are no longer needed.
After initial cleanup... use tomato sauce... spread around where the smell is... this is the natural way to remove even skunk smells... but don't leave it on too long as tomato sauce has mild acidity... then use Lysol disinfectant cleaners... should be fine afterwards.
Ditto Raritan KO ... an enzyme based chemical system ... and alternated with 'heavily CAUSTIC' soaps/detergents .... ie. Lye Soap from an agricultural supply shop - Agway, etc.
Both the enzyme based and the caustic based need SOAK TIME to work.
When finished with the 'caustic', add plenty of vinegar, then lots of water, etc. to help neutralize and dilute before pumping out.