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Protip for the uninformed and curious: if you get on all fours in your shower and squeeze as though attempting to defecate, you will likely break wind. Having done that, make sure the water is falling on the small of your back and push hard and as soon as you expel air immediately "suck in" your anus, which causes air to be sucked back in, and then squeeze out again. You can produce small-ish farts by doing this and more importantly allow a small stream of water to enter your anus and be expelled along with any feces lining the sphincter. Personally I also put a lot of body creme on my middle finger and slowly, carefully manouvere it inside the anus and simply scoop out - in circular fashion - any feces that may be sticking to the inside, just like when tomato or brown sauce gets stuck inside the plastic sauce bottle and you have to unscrew the lid and scoop around the inside. Another way is to simply lay on your back and push your legs over your head so that your anus is directly facing upwards towards the showerhead and then carefully "gape" yourself for several seconds. This latter option also produces the bonus of a warm, tingling, "filling" sensation inside the anus itself.