Getting sewage smells out of fibreglass

[SV_Crucible]

Update: after bleaching affected areas several times with limited effect I did two or three applications of vinegar over a few days and got rid of 80% of the smell. I've had to leave the boat to return to work so I won't know how well things have held up until spring but presumably the more concentrated vinegar will do the trick.

Muchas gracias for all the advice.