ELI5; why do reusable bottles and mugs need washing before use?
In: Chemistry
Dirt can get in and contaminate them. If they are being recycled, they want all dirt out of them. A lot of recyclable material is deemed contaminated if dirt gets into something else that is accompanying it. So a bin full of recyclable material could all be thrown out because just one item has some dirt in it. So whether you are recycling or reusing, you need to clean the items in question.
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