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The Franz swaty would be used like the Krystolo. If you feel the razor tugging during a shave, stop and do 4 or 5 strokes, and see if it isn't better. Strop and enjoy the shave.

The Chinese 12k...

I used a little oxygen bleach and hot water with mine when I went to clean it last. Took the green paste right out of it after a couple of scrub and soak cycles. I'm sure there was some residue, but...