50, 000 times vibration per second is from the tip of this machine, therefore you do not have to wash by hand anymore.according to the kind of spots, you would better to use some detergent. concept of powerful ultra sonic with 50, 000 per second to remove the stain how to use for using with soaking in water 1.fill a basin or container with enought water to soak the clothes 2.press the operation button gently rub the cleaner tip on the stained part (hard rubbing is uneccessary) 3.for some of the hard stain, can apply some detergent for clothing on the stain & rub it by the tip