on the way home from the dealer after buying my 98 rs eclipse about a week ago, I drove through a sprinkler that was spraying into the freeway. When I got home the right headlight was full of water. Should I take it to the dealer or is there an easy way to clean it out myself?

I would take it to them. Just make sure that they dont screw you. You could take it out, its not easy you have to take the front bumper off, and check it for holes or what not. You could use silicon to help with water getting in it.