Indeed, thats what would happen again if you lacquered it and car lacquer isn't as tough as a factory finish. I'd recommend
Nitromors to strip the old lacquer
Scrub with either a brillo pad or some scotchbrite pads and soapy water and even try to get the fine maroon coloured pad.
Any deep scratches may require some emery paper, work up to a 2000grit.
If all is fine and uniform use some autosol and some elbow grease
You can finish off with some meguairs NXT polish which gives a protective coating but doesn't loose the shine.
If you want to miss the megs stuff try some regular car polish to protect
If you don't relacquer you'll have to polish now and again to keep the frame looking good.
its quite labour intensive, but not too hard to acheive a good result and it is satisfying
and questions stick em in here and we'll try to help.