opening up the headlight enclosure?

as luck would have it, the morons who cleared my front headlight assemblies and installed hyper white lights got finger grease on the bulbs. while one of the bulbs didn't explode, the other one did leaving it all messy inside. and the other side is suffering from condensation or some type of moisture getting in there, making it look shitty.

im not about to take it back there and have them screw something else up. does anyone know how to remove the enclosures so i can clean them and re seal? possibly how to seal them better than what the idiots at the shop did? and also, what do i use to re seal?