where do I buy car brite power pak?

I used#9 by Meguiars. It removed 50% of the spots. I had to really really buff it hard with my hand. My hand felt like it was about to fall off. I did it 3-4 times but the other 50% just doesnt want to come off.

Should I buy the 3m smirl mark remover? I am tired of spending money on products to fix this problem.