bleach will break down if the log is left in the sunlight for 12 to 24 hours but I also would not suggest it. personally I'd use a stiff brush (I use a toilet brush just don't get it confused with a regular toilet brush ) and a anti bacterial soap scrub it really well let in sit for 20-30 min for the anti bacterial action to work and then wash it off with super hot water. I then treat with a spray sanitize like chlorahexidine or f10 let it sit for 20 min and then return it to the enclosure.