Help, slime growing in buckets

Hi,
I grow my weed in DWC and have been doing so for a couple of years with no problems. Now all of a sudden I am getting slime growing in my buckets and root rot every time I try to grow a plant. I clean my buckets with a bleach solution and wipe down my hose and dunk my air stones in bleach solution, but it just keeps coming back. Do I need to replace my stuff every so often or can I clean this stuff up. I'm kinda broke and could use some advice on the best way to clean this mess up. I did let the roots rot in the buckets for a couple of weeks after my last successful harvest, so I'm sure that is how the problem got started.
 
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