corner leaks

I also use PolySeamSeal White to recaulk my Pod.  After carefully removing the loose caulking, I use a small rag with 3M General Adhesive Remover #8984 on it to clean the area.  8984 is about $10-15 a quart but lasts for years (available at most auto-parts dealers and auto-paint stores).  You only need a small amount on a rag to clean.  It is used to remove decals from clear coat paint.  So it is safe to use on the Pod. Don't let it dribble onto the Pod's decals...8984 is designed to help loosen decals!  It also removes 99% of dried-on bugs.
Loose or cracked caulking can accumulate dirt in the cracks. Caulking needs a clean surface to adhere to. Polyseamseal seems to withstand rain and heat-cold better than any other caulking I have used. I also agree that silicon-based caulking is a poor choice for repairs.  Once the silicon is on the Pod, it does not allow you to re-caulk well later.  I think that the silicon leaves a coating on surfaces which inhibits adhesion when you try to redo it. Silicon caulking also seems to attract and hold road dirt tightly.