I've used Bohning products and much like the Xcellerator, but use sparingly and work in good. Scorpion Venom is also good and in my bow case. It comes with a leather patch.
The standard, usually kind of hard, Seal tite, use a lighter to heat up and apply. After applying work in well.
I shoot a lot when I shoot so I wax after each session and ready to go for the next session.
If wax builds up, you're not working in good enough - just don't work until string gets hot.