u/Spare-Wing-3401

I got this 60s waterfall lamp for a very cheap price and I'm going to do my best to restore it! I've never done this before im totally winging it lol. Is there any way I can take this gunk off without ruining the original gold metal color? I tried bar keepers friend and it took off everything and went back to silver. (Last picture is its original state and 2nd to last is what bar keepers friend did)