>>2831525literally use your left hand.
half the world does it, so it must work.
make sure your nails are trimmed, and you have water and soap to clean up your hand.
grab a bottle and poke a hole in the cap and rinse your anus after.
if you dont have access to water or soap, clean your hand with dirt.
perform the smell test, if it dont smell like shit, its mostly clean (but now dirty)