This is totally baseless and it is an innovation, since you mention the name of Allah and believe it purifies the clothes by washing a small corner of it three times. You must  stop that immediately and washing them regularly in the washing machine is totally sufficient.

We wash our clothes in washing machine. After washing the clothes I take a small corner of the clothes and wash them by hand three times saying Bismillah. Does it make the clothes pure if there was any impurity or nachis in them. When we wash clothes in washing machine how do we make the clothes pure?

Purity | June 11, 2017 7:06 am
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If a woman does the ultra vaginal ultrasound for health issue, will she need to perform a farz gushol for that reason. Please note that it’s a long rod type devise go inside the woman’s vagina.
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If the first water of men’s penis(which is very light, sticky & water coloured) came out for any reason, is shower mandatory for it or I have to just wash the place. If the liquid stick with the clothes, do I need to change the dress for salah?