The yellow stains in the armpits of your shirt are not due to your sweat but they are caused by your deodorant. These yellow stains appear due to a chemical reaction of minerals (mostly salt) that react to the aluminum in deodorants.

The easy solution to prevent the yellow stains in the armpits is to change your deodorant and opt for one that is aluminum free.

It is possible to remove the yellow stains from the armpits of your clothes if they can be washed. Check the label on the shirt to make sure that your clothing can be washed. Do not use a chlorine bleaching agent as the stain will become brighter and even more yellow.

B & M Dry Cleaning is at your disposal for any problems that you may be facing with persistent stains.