I use white vinegar cca. 1dl. I pour it after first water intake and I put detergent between first and second water intake.
I noticed better stain removal, color retention and smell improvement.
I may be under the influenece of placebo effect, but to me laundry seem to be washed better with addition of vinegar.
Leftmost one is this motherfu***r: Ratko Mladić A Serb that's responsible for a lot of bloodshed and ethnic clensing.
Next to that peice of shit is his undeling.
Next to him is Thomas Jakob Peter Kerremans.
Rightmost one is also Mladic's underling.