I use Zaino glass polish but I don't know if it would lessen scratch marks.
You can try this product which says if eliminates light scratches on glass.
http://www.janvil.com/glass_restore.htm
"The JANVIL GLASS RESTORE glass polish system is designed to improve the appearance of scratched and chemically damaged glass surfaces and remove minor scratches, haziness and spots from most glass. Perfect for anyone to use since no special equipment or skills are required. The only product of its kind designed specifically for removing minor damage from glass using a hand polishing method"
You can try this product which says if eliminates light scratches on glass.
http://www.janvil.com/glass_restore.htm
"The JANVIL GLASS RESTORE glass polish system is designed to improve the appearance of scratched and chemically damaged glass surfaces and remove minor scratches, haziness and spots from most glass. Perfect for anyone to use since no special equipment or skills are required. The only product of its kind designed specifically for removing minor damage from glass using a hand polishing method"