I'll give the tar remover a shot.

Stressing here that this is ALOT of tar. I'd say like a quart jar worth stuck to the tire and up in the tread.

Any thought on using heat? Thought maybe I could take the tire off, let the air out and maybe use a hair dryer or heat gun (on low) heat it up enough to scrape it off.... ARGH these tires have 5000 miles on them!