Sometimes it is months between the use of bleach for c-41.

I actually use e-6 bleach for my c-41 work , mainly becuase it was found for free at a reuse shelf at my local HHW depot, and thus was too good a deal to pass up.
(On the other hand I use c-41 strength fix for e-6).

I have a dedicated fish tank 'air stone' that I poke into a bleach jug and let a fish tank air pump gurgle it overnight, if the belach has not been used for a long time.