Thanks, Pete.
I believe that's what I've been using [see scan].
The Staedtler/Mars-Plastic is a relic from my draftsman days, 47 years ago, and still works fine. I think the Entre is the same type, and it seems to work as well.
But I seem to remember that in my shop there were putty-like, maybe art erasers, that some claimed to be superior.
Anyway, this thread has impelled me to flip through my collection, and I see that I have at least a half dozen to clean up, which I now look forward to doing.
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