Well, I dont have the answer YET but I might soon!
I just bought a 120 that has a few small scratches and one wicked one!
so I have been asking around and there are 2 main ideas that keep being mentioned.
1- windshield repair kit. I bought it at pepboys for like $10 this will be atempt #1 its made by permatex and advertises for cracks up to a foot long so it may fill the bad scratch just nicely.
2- is a polishing kit from home depot for also about $10, its for a dremel it comes with felt polishing weels and a jar of jewlers ruege. 4 differnt people i talked to said that they had used jewlers ruege when cutting glass to polish it back clear or removing scratches after a cut. another guy said he used it to take scratches out of his windshield after he lost a wiper blade and the metal arm tore up his glass. He said it took him 3 days of working on it but when he was done he couldnt even tell!
I have allready bought both kits and will be trying them out within the next 2 weeks!(as soon as I have some free time!)
anywho I will post the results (possibly pics too) as soon as I get started, any one else hear of any better ideas or have any comments?