All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad is His slave and Messenger.
The method of purifying clothes is by pouring water on the place that has become impure and inundate it with water until the impurity disappears.
As for dipping the clothes in a little bit of water, then, according to the view of the majority of scholars, this will lead to rendering the water impure, and thus, the water becomes useless and unfit for use afterwards.
Therefore, it is obligatory to pour water on the impurity until it is removed, and not the opposite.
For more benefit, please refer to fatwa 83760.
Allah knows best.