When I got this little laundry bar in my monthly box, I tossed it into my travel bag and didn't think about it again. Then a few weeks later, I was on work trip and stuck in a hotel for 11 days with weather changes I had not entirely packed well for.. and the hotel's washing machine was out of order for a week. Really.
I hand-washed a few things in the sink first, and there was no residue, it wasn't hard to rinse the soap out of the clothes, yet it still made the water slightly milky in-use, so I could at least tell that I was using enough of the lather and could tell when the clothes had been rinsed enough.
Two days later, I washed 6 or 7 items in the tubs, and lathered each one up then stirred them all to agitate, then drained, rinsed with the shower while the drain was open, refilled with warm water, stirred again, picking up each piece and dunking it up and down, then drained again, shower-rinse again, filled with cold water, stirred and dunked a few more times, drained, shower-rinsed with cold for like 3 minutes, then I squeezed the excess water from the clothes, rolled each in a clean bath towel to soak up most remaining water, and laid all flat to dry. They were all totally clean! And not stiff once they dried! And they smelled just slightly of the light clean scent of the laundry soap. I love this product! It was a huge help on my trip and I will definitely keep buying it, as I travel often.