Yellow sweat stains on shirts

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DH normally washes his shirts but I did today and the yellow stains in the pits & collar are awful.

Any tricks to remove these much appreciated!

I searched for the same and found this thread. Hope someone has an answer.

Soak in vanish/oxi over night and wash as normal, dry in sunlight.

I had this years ago and I am not a sweaty person, quickly worked out it was my deodorant. Switched to invisible black/white, problem gone

Biological powder and Vanish spray on the armpits.

Thanks everyone! Will gives these a go!

Would Elbow Grease spray before washing work?

A day in bright sunlight does wonders

I actually tried elbow grease the other day & didn't think it made much difference

I think it worked on mine, but the top is still on the washing line, so it might look different when dry.

I think in my case the sweat is ingrained. DH normally deals with his shirts so it has been left much longer than it should have 🤦🏻‍♀️