Do your white T-shirts tend to go grey? White socks look dirty no matter how many times they’re washed? Try one of these tried and trusted methods for making whites stay white.
Soak in a solution of 4 litres water and 180g bicarbonate of soda.
Soak in hot water in which you’ve dissolved 5 aspirin tablets (325mg each). Add 240ml white vinegar to the washing machine’s rinse cycle
Source: Readers Digest