The other way around
If you're using two rinses you can even do better by putting the vinegar in the first rinse and the FS in the second. The vinegar helps to get rid of the suds (the alkalinity) and the sooner it is added, the better it works. And the fabric softener should be added to the very last rinse to get the best effect of it.
If you're using two rinses you can even do better by putting the vinegar in the first rinse and the FS in the second. The vinegar helps to get rid of the suds (the alkalinity) and the sooner it is added, the better it works. And the fabric softener should be added to the very last rinse to get the best effect of it.