NO NO NO, no household bleach. No, you don't need long soaks.
Remjet layer is removed by almost any weak base. Sodium bicarbonate works, borax works, sodium carbonate works... I mostly use bicarbonate.
But you need the mechanical removing. Rubbing under water with fingers works great, BUT you risk having remjet particles that stick to the emulsion side. I have used this procedure:
(1) Soak in warm sodium bicarbonate or sodium carbonate bath (I have used a few tablespoons per 5 liters) for a minute, with gentle agitation
(2) Move the film to a large bucket or sink full of warm water, run the film gently between your fingers
(3) Move to a second bucket with water just like in (2), repeat running between your fingers.
This usually gives satisfactory results with some small remjet specs that are hard to distinguish from the dust and scratches this kind of processing gives you anyway

. However, sometimes I have repeated (1)-(3) with new, clean baths after (3).
Developers are alkaline and thus they will also soften the remjet backing. So, even if you had some remjet remaining, developer will get rid of most of it.
Please note that these tips are not for "clean", high-quality process, and
will leave some minor defects. If you want to do it correctly, you need to have a special machinery with water sprays and rotating buffers. Carefully oriented water sprays are used also on emulsion side to ensure that the dirty, remjettish water cannot get to the emulsion side.