Could be the plastic contains a phthalate? Without knowing more, it seems that labeling products under Prop 65 that are clearly intended to be used for food service isn't "kosher."
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Can you get idophor or star san? you might just need to shock your system with something new. you might even do a bleach wash down on everything. Rinse well after.Rinse the bleach solution off. When using iodophor or starsan there is no need to rinse and rinsing could possibly reintroduce bacteria.