After a wet ride, do you happen to notice that whenever you apply the brakes you hear a sort of grinding sound coming from the brake pads? That's because your rear and front wheels pick up a lot of fine grit, and when you brake it gets embedded in the brake pads and leads to rim wear. So to protect those expensive rims here's some simple maintenance. As soon as you can, remove the wheels and take a piece of sandpaper in the 120-180 grit range and sand the face of the pads that make contact with the rim. Just a few passes will remove this grit and give you a lot longer wheel life.
When using full carbon wheels without a machined brake surface, make sure you use the correct brake pad to make sure you have adequate stopping power, not to mention so you don't ruin your investment! Many times these brake pads use cork instead of the rubber compound you are more familiar with.