I wouldnt advise the use of abrasive or chemical substances to be used on yout cd's.
"Unless specifficaly designed for the purpous"

You can get a cd cloning utility, If the scratch is not to bad the image maker "clone cd" for example,
can make your copy cd readable where the origional was damaged,
You would still need the origional cd to play.
Its not guaranteed to work. Depends on how big the scratches are,

but i think cleaning the cd with Brasso will render its waranty obsolete.