The bad thing is a leak can be tens of feet away and run down that joint and finally run out. So go around with a wad of TP and stick it in the joint along the boat where you can get to it. If it comes out wet keep going towards the bow.....not spraying - pumps do not cycle on
It's most definitely from the RAIN
Means, would likely also come in in a busy sea.
Ideas?
RWS
it may be residual water from the pressure washing also.