need help with, striping/ finishing plastic. taillight conv.
 

hey everyone..
i'm in the midde of a tailight conversion, i pulled my D.S. tailight apart and started to gut it out.. when i did i noticed that the black (Paint, stain, or whatever it is) on it inside of the outer clear lense is faded and missing in some spots... i tried paint thinner to remove this but had little sucess also used 400 grit sand paper but just made a mess out of a small part.
dose anyone know the best way to strip the rest of this paint off, and how to resuface anyof the scrathes... i'd also like to sand down any of the manufacturers markings on the clear parts of the lenses..
thanks for your help.
Z-Fiend
can supply pics if needed