You should find an "Audio Restoration" tool on your Tools menu on the toolbar if you have a reasonably recent version of Soundforge.
You might also find a "Click and Crackle Remover" on your FX favourites menu- probably by Steinberg or Sonic Foundry.
The trick with that is to run through the presets (Six, I think) with the little box ticked that allows you to hear just what is being removed. It's called "Keep Residual Output".
Adjust the controls till you just hear the clicks and crackles and none of the music. Then UNCLICK THE BUTTON before you press OK to process the track. Otherwise you'll just have the crackles left.
Cheers
Dave
(certified expert!)