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I puncture a slit in the neck of a coke bottle and squeeze that to wet/dampen my buttocks..., maybe add a bit of soap in there and shake it up. I use than in combination with wiping. Things end up pretty clean
The main issue is how deep you get up in there with the toilet paper, and whether you wipe forwards and backwards. You really have to wipe in both directions, and push up in there a reasonable amount to get it most of the feces
The toilet paper should be spotless after you're done