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It is a preference thing. Worst case you will end up digging the soap
out of the mug with an old dull bent butter knife.

Having a puck of hard soap in a mug works well with a half face half...

lots of things to try. Since ther are a lot it pays to just tinker.
Experimentation with shave soap is not expensive. If you can find
It Williams shave soap is as inexpensive as it gets. VDH is...