I did Kalk paste over mine. Took a few times but worked. Where it didn’t I let the rock dry out for several months and that did the trick. Lol I bought the stupid stuff when I was starting out...
Yeah, mine came back. It's on a major rock that is like 20in. long and covered zoas. I could probably hammer and chisel up the rock and take what I want off of it. If anybody wants the leftover, let me know.