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I knew someone from a culture that washes their rear with soap and water after defecating. I was told they refer to Americans as "unclean ass" and are horrified that we just use paper and do not wash.

How does it work? I get that a bidet is going to be cleaner than paper, but it seems like the continuous stream is an important factor. I can't really visualize how using a wet hand is going to do anything but make a mess. Sure, you wash your hand afterwards...but you just wiped a bunch of unsanitary water around a place that doesn't get a lot of fresh air.

I use one of these. I never touch my ass with my hand while doing it.

http://www.aliexpress.com/item/ABS-Toilet-Handheld-Bidet-Spr...

How do you properly clean yourself without using soap?

Soap will dry out your bottom. Water only there.

Water power seems sufficient. I mean, I've not done swab tests post rinsing. It strikes me as better than smearing with paper until I can see any more residue on the paper.

How about your hands though?

I wash them. In cultures where one cleans his behind with hands, one usually finds a tap at knee level just next to the toilet....