I have to use it on my husbands stuff when he comes back from sea to get it white again (the Navy doesn't bother to separate whites and darks LOL). It never really rinses away, you can always smell it after I take the clothes out of the dryer. I'm sure it can cause skin irritation.
For everyday whites, I just put them in before bed with detergent, let the washer fill and run for a few minutes to mix it all up then leave it overnight and finish the cycle in the morning.