It's possible to fix the damage to the mitt by using straight ONR on it. It might take a few applications to get the clay mitt back to a less sticky state. Depending upon how much tar remover you got...
The 15es is definitely under rated. It's so smooth! I prefer to cut with the 21 and polish with the 15. Both are amazing machines. Once you get one you'll want a mini 75e!!
A trick I like to use is M205 one or two drops with a spritz of water. Learned this trick from Kevin Brown. It really helps when you have sticky paint!!
Using old school method vs new school method doesn't make Junkman a "hack". He has taught several thousand YouTube viewers how to polish paint and how to execute the two bucket wash method.
This is with respect to medical coverage. If there is an injury you go back to your own auto insurance policy for payment for your medical bills, regardless of fault, hence the term "no fault"