We were lazy and did not wash the white shirts right away after wearing. As time goes by, there is yellow stain on the collar that we cannot wash it away now, even with bleach or lemon juice.
I should be grateful if you can kindly advise how the yellow stain can be removed without damaging the fabric.
282600cookie-checkyellow stain on white shirt collar
Not sure what it is, but try sugar soap as a spot cleaner. Spray on, rub in and rinse. If that doesn’t work, try Ajax Spray and wipe. If that doesn’t work, White King Stain Lift laundry prewash
Try Kenco (from Bunnings). It’s a degreaser, but use it as a prewash
https://www.drchemical.com.au/questions/shirt-collar-stain