BS”D
Yes, what tamazaball suggested sounds best – oxygen bleach. We in Creedmoor use it to bleach even drug money with great success :)))). (Seriously I use it in exceptionally polluted, super hard water to soak tzitzis and it works very well).
The chemical in it (sodium perborate) should act as a disinfectant and it also reacts with chemicals in the water that may be responsible for the odor.