To set the stage, I've been crazy stressed out lately from work, actually both of us have (haven't been on this site in a week). I wear a mixture of disposables and cloth diapers, but during exercise it's almost always a Depends pull-up. Yesterday, I came home for lunch to find out my wife had done a wash with one of my used Depends in it. Oh joy!
Now I think this is both of our faults, her for not looking carefully through the laundry before washing and me for leaving my used Depends in a pile of clothes. Anyway, I don't know if anyone has washed a disposable before, but it was a mess.
This is a front loading washer. Here's what I did. After taking the clothes out, I wet some paper towels and tried to collect most of the loose SAP that had come out of the diaper inside the washer. Then I set the washer on a 30 minute rinse cycle. After that was done, I set it on another wash cycle, this time with vinegar and detergent. No clothes. While this was going on, I took the pile of clothes out in the driveway and, after shaking them separately, I cleaned off the remaining SAP on each item with a hose sprayer. Then I put the clothes back in the now clean washer and ran a heavy duty cycle. After that, they came out clean with no SAP.
Towards the end of this process my wife called me. I told her about it. I found out later her office mate overheard the conversation and asked if she could get tips from me just in case her partner accidentally washed their baby's disposables. Sure, why not. At this point in my life, I don't care who knows I wear diapers. Anyway, good times.