I use chlorine bleach to disinfect my washer after a good cleaning. However, it's not a substitute for manual cleaning with a soft scrubber sponge and a brush. Chlorine will kill your mold/algae, but not get rid of the residue. Here's what I do. Drain the washer, scrub with dishwashing detergent, rinse, fill with water and add chlorine bleach (a weak dilution does the job), let sit for some hours (overnight), drain, rinse, refill. This is really only necessary when I get stuff growing in the washers. They stay clean for a several day printing session and then I drain and dry them till the next session, so no washing needed.
Best,
Doremus