All you can do is to polish them out if they are not too deep , this will leave the slide shiny , or take some very fine crocus cloth on a wood block and sand the sides , if the scratches are on the sides , by doing this to both sides and taking straight full length swipes you can make the slide look pretty decent . I usually bead blast stainless guns so they are not as flashy , this will look the best . Good luck , Mike...
