Some of my T-shirts had acquired that mildew smell and it wasn’t washing out. Left them to soak in a bucket of water with a cup of vinegar in it. Washed again and hey presto - back to smelling fresh.
I do this with running kit.. I’ve also taken to hanging it out on the line as soon as I return from a run then washing it later, rather than sticking it in the washing basket damp. Because UV I think
Some of my T-shirts had acquired that mildew smell and it wasn’t washing out. Left them to soak in a bucket of water with a cup of vinegar in it. Washed again and hey presto - back to smelling fresh.
This felt like a very middle aged win.