Room temperature water? No washing powder? I'm not familiar with underarmour but it sounds like you're just rinsing it instead of washing it.
Fwiw I wash mine at 60°C, as it kills the bacteria.
this post was submitted on 21 Aug 2023
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Washing powder is just dry laundry detergent.
Any detergent/soap should theoretically kill bacteria even using cold water. It destroys the cell membrane.
Sadly for whatever reason it doesn't (google confirmed this)
Welp that's a bit of a rabbit hole i didn't expect to go down today lol
Washing at 60° C is only really required for people with a compromised immune system or in a household with certain infectuous diseases, which may spread through clothing or other textiles. The bacteria on clothing are not usually pathogenic to the degree that a 60° C wash is necessary. For whites, bleaching is also an alternative.
If you use the same washing powder for your other clothes then it's probably safe for your athletic clothes as well.
I don't see why washing powder would not be okay for synthetic fibres. The only possible issue I can think of is using washing powder for white textiles, which contains bleaching agents and other substances that would fade colors.