I've been using a stick deodorant for years and I always get this white residue that builds up on my black t-shirts. I've tried rubbing it off before washing but it doesn't really come out. Do you have a technique that actually works?
I've had the exact same problem for ages and it's annoying. What really works is wetting the fabric with a bit of cold water and then scrubbing with a clothes brush or even an old toothbrush before throwing it in the machine - cold water is important because otherwise it sets the residue. Or you can also try soaking the garment for 15-20 minutes in water with a bit of white vinegar before scrubbing, that breaks down the white stuff deodorant leaves better.
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