The claim that putting an empty plastic bottle in your washing machine improves washing performance is a popular household tip, but there is little scientific evidence to support it.
Here are the facts:
Reducing tangling: An empty, sealed plastic bottle moving around in the drum might occasionally help separate some items, but it can also become trapped in clothing or create uneven movement. There is no evidence that it reliably prevents clothes from twisting.
Improving cleaning: There is no evidence that a plastic bottle improves detergent distribution or cleaning performance. Modern washing machines are already designed to circulate water and detergent efficiently.
Protecting fabrics: While a lightweight plastic bottle is unlikely to damage sturdy fabrics, it could potentially stress delicate items, make noise, or interfere with the machine's normal operation.
A few safer and more effective ways to reduce tangling and wrinkling are:
Avoid overloading the washing machine.
Wash large items (such as sheets and blankets) separately from smaller garments.
Fasten zippers and buttons before washing.
Use mesh laundry bags for delicate items.
Choose a gentler wash cycle or a lower spin speed when appropriate.
Remove clothes promptly after the wash cycle ends.
So, while dropping an empty plastic bottle into the washing machine is generally a harmless experiment if the bottle is small and securely capped, there is no strong evidence that it "completely changes the way you do laundry" or significantly improves cleaning results. The claim is best viewed as a household anecdote rather than a proven laundry technique.
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