Not sure how the $25 one from the OP works but most bidets have an on/off switch. Switch it on (wince a little in surprise), wait til you feel clean, switch it off.
They’re not entirely a replacement for toilet paper either, as you still need to dry the water off before you put your underwear back on. That gives ample opportunity for an, ahem, more in-depth inspection of your cleanliness once you’ve finished spraying.
