If you do replace the laser keep the original as it may possible to repair the connector. But it may have got zapped in the accident.

If the casing is marked, go over it with a fine marking pen and rub over with your finger. A Papermate. Preciseroller 0.5 works fine.

If the display is marked, go over it with Duraglit wadding. Polish it off with toilet/kitchen roll and finish with a soft yellow/micro-fibre cloth.

A nice dark shine can be had with Mr Sheen. Use a toothbrush for the buttons. You could strip the controls for a really good clean. Four or five applications of Mr S. will give a nice finish.

Clean the laser with meths. Remove the rubber boot if has one and replace it when done.