The method is simple. Place a clean, empty plastic bottle inside the washing machine with the clothes and make sure the cap is tightly closed. As the drum rotates, the bottle moves among the garments. Supporters believe this movement may help prevent clothing from becoming tightly twisted or tangled during the wash.
Some people also claim the technique may help reduce wrinkles. Clothes that become tightly bundled together can sometimes emerge from the machine heavily creased. If garments move more freely, there may be less bunching. However, results can vary depending on the machine, load size, and fabrics being washed.
It is important not to expect miracles. There is limited scientific evidence showing that an ordinary plastic bottle consistently makes clothes cleaner, softer, or less wrinkled. Many laundry hacks are based on personal experiences rather than controlled testing, so something that works for one household may not work in another.
