cleanse    kwēza, gukēmūra
(~ house ceremoniously after death) kwīkōmvōmvora
(oneself) kwīsukura
En-En dictionary 
kwīkōmvōmvora (-īkōmvōmvoye)     v    to cleanse house ceremoniously after a death
kwēza (-ējeje)     v    1. to purify, to cleanse, 2. to make white (from kwera)
kwīsukura (-sukuye)   v    to wash, cleanse, purify oneself
 cleanse found in: Kirundi II (Grammar)
chapter 3   Conditional Sentences – “if”