My 2001 M5 that I bought a few months ago has a lot of heavy contamination on the hood. This includes water spots, also what I think is sap and some haze. I spent many, many hours claying with Pinnacle XMT. While I can see that I am making progress, when I do the bag on hand test I can still feel all kinds of little nibs. My question is should I jump up to a really heavy clay bar like Chemical Guys Heavy Black or should I just jump in and start compounding with 105?