2006 Honda Odessey EX 185K, NO sunroof, Driver's fuse box full of slimy water.

2006 Honda Odessey EX 185K, NO sunroof. Much slimy water in driver's
fuse panel, caused several failures: car alarm activating, key fob lock/unlock
doesn't work, clicking noises around van (rear hatch, under hood, Lrear side
panel). Drains battery to zero. Mechanic sees small crack in fuse box seam
for water to enter, can't tell where it's coming from. Also, driver's rug wet.  
More info: I bought used at 40K, came with intermittent windshield whistle,
now more consistent/louder.  Also over past 2yrs I engage driver's seatbelt
and it's soaked at L.shoulder (after rain). Caused slight tear which has
shredded/must replace. At the time, dealer said replace door gasket (not
sure if driver's or slider).  I now see a reply to remove wipers & may find
debris underneath. Also some say remove roof rack and seal possible leaks
in tracks. Anyone else have these issues? Any ideas how to determine
where to look for leaks to prevent replacement fuse box from filling up
again? Thanks!