My latest order was a reorde. This time I ordered a large amount so I could share with my grandson and also my daughter. My grandson said he found with the first bo0x I sent I’m (a year ago) there was often a bit of white residue on his dark clothes. My advice was not to pack so much into the washer so things rinse better. He hasn’t commented as to whether that solved the problem.
I have never had that problem myself.