White clothes can acquire colour stains from contact with coloured clothing or vibrant products, such as spices and coloured powders like the ones used to celebrate Holi. Using a bleach to target colour stains is effective with white fabric; try using oxygen bleach as opposed to chlorine bleach as it can be used in conjunction with detergents. It may be a good idea to clean your machine after washing colour-stained clothes to ensure any remnants are removed before the next wash.