I would recommend that you replace the BioWheel. They are made out of a paper-like fiber (possibly even paper) and the bleach may cause it to break down significantly causing it to disintegrate in your tank. Plus, the only reason that you are not supposed to replace BioWheels is to maintain the bacterial cultures. The chlorine in the bleach will wipe those out anyway. Might as well go for a clean start and culture some bacteria from another tank or a store-bought source.
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