Simple laundry habits remain more dependable. Avoid overloading the washer so clothes have enough room to move, sort laundry appropriately, use the recommended amount of detergent, and select suitable washing settings. Regularly cleaning the detergent drawer, checking the filter when appropriate, and allowing moisture to escape can also help maintain the machine.
Ultimately, the plastic bottle method is an inexpensive experiment rather than a guaranteed laundry solution. If you try it, start with a small, ordinary load and monitor the machine. Stop immediately if the washer becomes unusually noisy or the bottle becomes damaged. Good laundry practices remain the safest and most reliable approach.