take them off, and bulbs out, use air compressor to dry them completly..
popem in oven at 100* for 4 mins to make shure all moisture is out or if your down here in south TX, just puttem out in the sun for 30seconds... LOL nah more like 15 mins.
Get fresh tube of clear silicone and reseal up the edges where lense and body meet.
before installing bulbs, lightly skin both sides of the bulb gasket or oring and install them.
Let silicone dry before putting on vehical... sitting them in the sun for 30mins will speed it up.
Shouldnt have any more moisture issues..
Might want to make shure the vent tube on the headlight is pointing INwards towards a shielded area. so that water splash doesnt shoot directly into them..