We use BumGenius sprayer and I love it. LOVE IT. It would probably be cheaper to make your own, but this came all in one set, was super easy to install and works great.
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I find it useful even on NB poop. The spray is super strong (you have to aim it well so you don't get poop backspray!).Â
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I had to recently rinse a diaper off without the sprayer by dipping in toilet and it was nasty, nasty. Sprayer is so much nicer.