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You have to be very careful when squeezing badger bristles. They do break.
Gently squeeze the leftover lather in to the bowl or what ever you use to build lather.

Yep. I've gotten a good MdC shave from the foam stuck to the lid.

The stuff is amazing.

If you reclaim the unused lather from your brush, you will probably get more than a year out of a jar.