theres a few topics around just now regards fleas and hutch maintenance at the mo heres my take , most incectesides will kill adults and babies but not eggs/larve . bleach will but drys/evaporates quickly and would require at least a monthly application ... a few cupfuls of irish lime should be used and brushed into gaps, cavitys then the excess brushed out ,the lime will kill all eggs/larve fleas, ticks,red mite ,ants slaters anything that crawls and jumps .only requires application twice a year late spring / late summer . the lime can be mixed with emulsion /cuprinol ect and painted in to se