Abū Hurairah Radi Allāhu ‘anhu narrates that there was a black person or black girl (a narrator experienced doubt as as to if it had been a male or female) who applied to comb the Masjid. She/he handed away. Nabi Sallallāhu ‘alaihi wa Sallam asked (his companions) pertaining to this https://jaiden9isah.ltfblog.com/31116381/a-secret-weapon-for-how-to-clean-mosques