You can put kalk paste on them, there's some instructions if you do a search, but it's going to be messy... You could try just cutting them off with a razor and then kalk'ing what's left.
That's one of the best ideas I've heard so far, especially if you're siphoning out while you're scraping. I've never been too big on kalk since it can mess up ph and chemistry, especially in smaller tanks.
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