I always use head guard tape. Normally 2 strips from about 8 to 4 o'**** position. I'm not sure why others don't as well. It is cheap, protects the head and grommet as well. I see so many people selling racquets that the racquet head is so chewed up because they didn't use head guard tape.
I use a product called "Goof Off" to take any tackiness off the racquet.