Hmm...i used to think learning scales was like driving; you never really forget. When you were learning the scaels, were you learning specific patterns? This is the way most ppl learn scales on guitar.

The guitar makes scale learning easier than piano since there are usually patterns to the different kinds of scales. go to the Homepage and click on the scales link. You should get all your infor there, goodness knows this is the site that helped me get my scales down tight.