My PIL pick up my LO from nursery once a week. I send a spare outfit in his book bag to change into after nursery (it's a forest school so he's proper grubby when he comes out.)
Every god damned week I ask if they can send back his dirty clothes for me to wash. Every week they keep his clothes which means it stays there for the week (he only sees them once a week).
I either have to drive the half hour there and half hour back each week to pick up the clothes or just not have them for the week.
Yes I know they are doing me a favour by washing them. Yes I know that I could just buy two more outfits, but it's a bit annoying buying 2 extra trousers, jumpers, vests, pants and socks. He's growing so quickly that I'm forever buying clothes.
How do I politely stop the PIL holding his clothes hostage??