Glare Auto polish - there is no substitute for an absolute showroom quality look - used to use Meguiar's, and it did a good job and is a fine polish, but I did one side of my tank with each and the Glare side just looked like polished glass and my tank is plastic. Highly recommend. It is somewhere around $30 a bottle, but you only use a very small amount to do the entire bike.
Great stuff. Web bike world did an article on this a while ago and really praised it also. Here is their review
http://www.webbikeworld.com/r2/glare...are-polish.htm
Here is the polish site
http://www.autopolish.net/