Best caulk
 

I need to clean out dirty seams on my deak aNd recaulk it
what is the best caulk not to attract dirt

3M - although there are some others out there too now - be sure it says Marine

I prefer LifeSeal

I've been using some stuff called Lexel - or Lexol. It is the best stuff I have ever used...

I've used it under and above water - this stuff is sticky and cures 'just right'.

Just my .02

I have used Life Caulk extensively on my refit. It always seems to come undone after a few seasons ( and the surfaces are always cleaned and prepped right ).

At the end of the day, I never rely on any silicone or caulk it critical areas - I do the over drill/epoxy thing. Just re-do one transom and you'll forever overbuild any areas that water can seep into !