Cheaper option is 30% chlorine to 70% water spray on and leave for 10 min, give the innards a good hosing and let the boat air out.Warning ,with any bleaching product exposed timber will discolour, so either remove timber or cover it well.
If timber has mould then you may need to treat it with a good timber reviver.
Good luck Ace
Cheers
Ken
P.S. Bleaching in inclosed areas can get you high