I just did mine a little while ago.
On the driveway, I laid down a couple sheets of Painter's plastic, or you can use a tarp. Duct tape it to your driveway, lay down the cover on the plastic and use a soft bristle brush on a long handle to wash it with some mild soap or boat wash. Hose it off and let it completely dry.
I applied the waterproffing with the same brush. Dunk it in a bucket with waterproofer and let it soak in really well, using the brush to really get in between all the fibers.
After if was done, it repels and beads water like never before.