DS2 kept leaving tissues in his pockets before dropping dirty clothes in the laundry basket. I asked him again and again to make sure he emptied his pockets and he just sort of half did it and half didn't make any effort.
Then one day, I went to take the washed clothes out of the machine and found that once again, they were covered in a shredded tissue, and my patience snapped. This time, I called Ds2 into the kitchen and made him shake each piece of clothing outside, then remove all the scraps of tissue from inside the laundry drum.
That was the last time I've ever had to ask him to empty his pockets. He gets it now.