Yellow armpit stains on shirts

[AmandaHoldensLips]

How do I get rid of the yellowy discolouration on shirt armpits? Good quality cotton and linen shirts, but the armpit areas just aren't coming up clean. They don't smell, it's just the staining.

Any ideas? I already use the dettol laundry cleanser additive which kills off odours. But it doesn't help with the discolouration.

I assume it's the deodorant that's staining. Not sure how to remove it, but I imagine it needs to be physically cleaned off

Isn't this what they do laundry stripping for? Check out Nancy Birtwhistle she's always got natural ideas and she's very responsive on socials.

Soak in Napisan for 24 hours then wash with biological washing powder, or a long soak with green bleach and washing soda (as per Nancy Birtwhistle).

I’ve found soaking in hardcore vanish works. Use a lot though.

amzn.to/3XQg7o1

I came to say Napisan too.

Scrub with a household soap before washing hot in ariel

An MN tip that has really worked for me is Ace Ultra, poured directly on the armpit and left for 10mins before washing (in a load that isn't overly full so it really moves around the drum). It might take two goes but it shifts it.

What's green bleach?