I've only had my '99 +4 for a few weeks, and one of the things that I've managed to get sorted is the water leak when it gets washed!
I applied some adhesive insulating tape over the foam strip that's fitted between the heater box and the bulkhead, which is a bit fiddly without taking the bonnet off, but it seems to have cured the problem.
I intend to make a 'proper' job of it later when I can take the bonnet off and apply a strip of black Duck Tape (in one complete length)and trim it so that it looks OK.
I hope this helps.
Sid
