Since there is a risk that the odor will spread to rice or neta, it is considered that strong-smelling strong detergent, bactericide and so on are not used to wash hands.
米やネタに匂いが移る危険性があるので、臭いを発する強力な洗剤や殺菌薬等で手を洗うことは避けられると考えられる。