Riddle
This has to be the cleanest thing she owns. Almost every time she does a load of laundry, this goes in. Last time, she saw she had forgotten it and spent ten minutes hunting it down before bringing it back and putting it in the washing machine, which doesn't always happen for other items she's forgotten- those can wait. It's not like it needs to be washed- but if it doesn't go in, she feels guilty. But you know what's really odd- she doesn't wear it or it touch it at all between washings.
What is it?
What is it?