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Probably it just tightens the skin to make the hairs stand up, allowing the electric razor to cut them closer to the skin. Kinda like 'Lectric Shave does.

I'm with 'grouper on this one... Post shave, I rinse with cold water and rub my alum block on my face and neck. Then, I start cleaning up and when I'm finished, I use my hot towel (now soaked in cold...