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If that edge gave way at all, then don't Ez-Off it.
Use a tooth brush with Simple Green , then Wd-40 it.
Then take another look at it.

Seriously, some like to heat it out, boil it out,,, I guess it all comes down to what method a person has experience with.

I watched my grandfather clean his, almost daily in a bucket, with a rag...

He blew himself up ! :rofl2:

The side shot seems to indicate a Carborundum, as stated by the guys. I would not let my DMT anywhere around it. It's tougher than it looks, even for your diamond DMT.

The surface looks & is, a...