Some people seem to be put off by the fact that its a compound and think its hard to work. On the contrary it's quite easy to use, has the power of a compound but is easy to work and finishes down like a polish generally. Long work times and no dust, I love it, and I still have the old formula. The new Optimum Polish and Compounds are quite stronger then before.
My advise to you, try #83. If after the first pass, nothing clears up, try again. Remember to work slow, with a good amount of pressure on the head. Work the area for about 5 minutes..
You'll be suprised what #83 can do. I like the product, but will be trying OC for some tougher jobs.