This happened to me
Tried everything to clean it
Found an embarrassing and trailer park fix.
I unplugged the clocks and
carefully went over the whole area with a permanent marker.
It works but under some angles was noticeably to me but must of mellowed with time
and now looks okay . The hardest part was the drip mark on the clocks clear covers.
That I tried everything from Turps to thinners and eventually metal polish.
The white mark has gone but you still can just see the drip at an angle.