A few months ago I purchased a 110 gallon tank with a fair amount of minor scratches. Before setting it up, I want to have a go at polishing them out. So being the lazy one I am, I finally got around to ordering a non abrasive scratch removal kit from www.janvil.com.
here is the actual kit: http://www.janvil.com/repair_systems.htm#JV430
It is just a starter kit, (and as you can see, expensive) after I give it a go and see if it works, and get the skills down, I will help any of you out that have minor scratches on your glass tanks. (if it works.)
I'll keep you informed.