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.
I noticed that mentioning commands you want gives good results e.g.:
If it's more complicated, pasting parial scrript for LLM to finish gave better results (4 me),
than pure prompt text.