I have a nice loofa sponge on a string I use to file off dead layers of skin, I always use a fresh clean towel to dry off the application area.
When I'm using a a big handful of RS Transaderm, I have some trouble reaching back there and getting a good spread, so I use my free hand to push up on my application arm's elbow, helping me get a nice far reach, and I use this position to Stretch my lats out 15 - 30 secs while I'm there.
Good stuff, love how it makes me feel.
-BRR