I tried to add a wav file into my map with scmdraft. I first played the wav and then saved the map. A few mintues later when I tried to delete the wav and then re-saved the map (hopping that my file size would drop); the map size remained the same. Is there any possible way to fix this?

I remember i had this problem. I forget how i fixed it though. try re-adding the wav then delete it again.

Compress the wav first. There is a small section on WAV's in the FAQ with some helpful information on doing this.

The issue isn't with the WAV size itself, it's that SCM Draft is not deleting the WAV, only the string attached to it. I would try saving in a different editor, see if it fixes it, although if you have many triggers that may not be a good idea due to string recycling issues.. Just to be safe, if you do do it, make a backup.

Open the map up in WinMPQ, and delete the wav there?