Don't see what that would hurt. I use Q-tips moistened in some solvent that will cut the built up juice, be it vodka, isopropyl alcohol, whatever. I don't have the cotton dripping wet, just moist. Then I gently clean the threads, and whatever else is exposed and needs to be cleaned up. Then let it air dry or you could use a blow dryer on a low temp. setting. This has worked fine for me and I so far have not killed a battery.
Hope this helps.....