This is literally just Zotes-brand laundry soap.
>not soap as a lump, whittled down becomes soap
>can clean people or clothing
This is a product that costs 3 dollars at a Mexican convenience store. This is multipurpose laundry soap. This, like a number of other relics, was inspired by something Tsucc saw in his own bathroom or in a drugstore. Hail Hex raided Ido Front on the 5th layer and one of the items Bondrewd dropped after the boss raid was cheap laundry soap.
Also,
>grown ass man bathes kid he just met while Riko and Nanch stand 3 feet away chatting