How do you get rid of armpit stains on white tops?

I am just unpacking all my pre-preg clothes and I have noticed that a lot of my white shirts / t-shirts have discoloured areas under the armpits....

Does anyone know how to fix this as I really don't want to throw them out??

TIA

Napison Oxy Action is pretty good. Or you can get the powder and make a paste and lay it over there for awhile.

Vinegar may help too.

The napisan version by coles is pretty good as well.

I have used and think the other spray I have in the cupboard is whiteking for colours in a blue hand spray bottle. Who knows they might have changed the packaging by now. Ive used that on white and colours and does the job.

Good Luck with your washing

If its crusty try the following:

Pour vinegar directly onto the stain, leave for 30 mins and rinse then apply sard wonder stick to the stained area, wash as usual and repeat if necessary. I got some of DH's work shirts fixed after only two washes, and I thought I was going to have to throw them out.