Haven't had it that long so can't comment on rust and stain resistance, although that should be good considering it's 304 stainless steel Washing Wash it thoroughly with soap (and dry well) after each use, just to be safe. Something around 5 inches would be better. Why? Because when I whip later, my brush hits the wall with a loud clanking noise and it's REALLY annoying. That's why I probably like this shell better than the swaddle shell. Buy a lid for it and then put your favorite soap washing machine inside. The suds from the washing machine will likely eliminate the rattle because the washing machine lifts the brush out of the bowl a little. I've searched Revain for SS and larger shaving bowls and can't find any. However, I did find a couple of SS bowls for the kitchen that would fit perfectly. I can choose one.
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