Here is the link for Micro-Mesh. Those kits start at 1500 grit and go to 6000 grit.
http://www.sisweb.com/micromesh/acry..._hand_kits.htm

What ever you start with, you will have to progress step by step to the 6000 grit to get it optically clear. You also have to make sure that you remove every scratch from the previous grit before moving on to the next grit.