They're for washing socks in, aren't they?
I have one in the home I purchased several years ago, and never used it...neither did the wife. The worst memory of this "cleaning" device was on a tour of Jordan in 1996 on the way to Petra. Our travel guide stopped at a paradox...a real structure; a decent-looking restaurant in the desert, near the tourist area of Petra. After crossing the Allenby border point, and driving for hours after nothing but desert, this was a welcome site. The food was great (always eat with your right hand!), and after several courses, I excused myself to use the "restroom".
The "stalls" had nothing but a porcelain surround for the dumper-hole...and on the ground, laying in "water" were water nozzels for cleaning...no TP. No soap to wash hands.....
I returned to our table, and as the immaculately-dressed waiter returned to our table, asking if we desired anything else....I stared at his hands, and said no. Oh, no...please!