Is there any way to keep this from happening. This is my second set of clear corners, and both times, I've gotten condensation in my driver side one which eventually makes them look like crap. Is there any way to clear these things up or keep it from happening? Thanks.
Remove them and let them sit inside for 24 hours or so. This will dry them out.
Once you do this, run a bead of outdoor silicone sealant, then press the bead into the joint with your finger.
This has worked for me in the past.