I just bought a bitzenburger with the right helical clamp.

Question #1 - I know to put the shaft in the jig and twist the top knob right and bottom knob left until the vane is making full contact with the shaft. When you twist these knobs does it change the degree of helical or is it just move the jig to make full arrow contact?

Question #2 - I will be using AAE 4" plasticfletch vanes. What is the best thing to use to clean the shaft and do I have to clean the vanes too?

Thanks for all the help!