Weird yellow spots on whites
I have a weird thing that's happened a few times these past two summers when I wash my kids' tennis whites. My washer is a 10+ year old Maytag top loader that (other than this issue I'm going to describe) has never given me problems. I wash on warm/cold using powdered Tide and nothing else. The laundry emerges from the machine with yellow spots in places. Not pale yellow under the arms or around the collars, but fairly bright yellow in what looks like random spots.
Soaking in Oxy and washing again fades the yellow but the spots don't quite go away.
I thought it might be stains from sunblock somehow getting set in the wash but then I washed some of my nephew's whites, and he hadn't worn sunblock, and the same thing happened.