If you have a pipe cleaner or a qtip just 2 minutes. Bleach kills instantly but it can't get under layers if, for example, mold is caked on itself.
If you can't get to the problem areas you can try speeding up the process by disturbing the liquid in an attempt to shake off the outer mold which would lift off revealing underneath.
I wouldn't worry about the plastic being damaged by the bleach. The plastic will be fine even if you leave it for hours and hours.
Bleach, after all, is contained in plastic so just leave it on there for whatever your patience level is.
Sitting in Bleach for an hour worked. Cleared out the red bacteria and black mold. Still smooth plastic.
Nicee
To tiny for pipe cleaner and qtip can't reach some places.
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