Firstly,you use wet and dry glass paper and sand till all the
scratches are gone.
Secondly,wipe the surface dry with some cloth.
Lastly,put some Autosol on the dry cloth and rub it on your ass in
a clockwise direction,that will smoothen it out and if you rub for
about 30 mins,your lil ass will start to shine.Oh and use the
buffing machine if needed,dont forget to place some powder on it
first,to ensure smooth work.
I'm a DnT student =)