MadaxeMax beat me to it, but I was going to advise a second rinse cycle whenever washing your clothes. Today's detergents are almost ALL "concentrated" and it's easy to use more than you need (or can be rinsed out.)
I've been having a problem with itchy, rashy skin all over recently. I think it could be the soap that the truckstops are providing (in the showers.) But, it could also be my detergent. Some years ago, I started using the cheap store brand from my local food store. Even THAT has changed, I think. Anyway... I no longer need to save THAT much money, and I'm gonna go back to a better quality laundry detergent. Maybe, even back to Arm & Hammer as I believe it is the purest one on the market. And I may do the second rinse cycle, too!