What use to burn in power cords?

What a silly audio nervosa-type topic as is the “solutions” proposed..

Interesting how so many cable skeptics waste their time, aging brain cells, precious ATP and electrons repeating themselves on threads about cables.  I am sure your family would prefer your attention.

OP, as suggested, just get an adapter and plug into your fan or refrigerator for about 12 days.

kn

Thanks. But I'm not clear if I have to support the power cord so it doesn't touch the floor.

Shunyata suggest plugging into a fan for their "break in" adaptor

https://shunyata.com/products/accessories/burn-in-adapter/

What's wrong with just plugging the power cables in with a load (something turned on)?

If you have a high-resovling audio system (mid high-end) then raising the cables off the ground will make an audible difference.

If you are entry level high-end or lower you will likely not hear any difference from raising cables off the floor.