I am thinking of implementing this for my 15 year old daughter, as I am done with it being so disgusting. Love her to pieces but she's bone idle, to the extent that empty crisp packets etc don't always make it to the bin that's right beside her bed!
In the next month or so, she is going to have her own bedroom as my eldest will be moving out. Until then, she will always have shared with her slightly older (tidier!) sister.
I wish to God I had enforced the no food rule when they were young. But it's something I'm going to have to do now, so that the new bedroom doesn't get out of control. I'm usually a soft touch but she has absolutely brought this on herself.
Is your teen allowed to have food in bed? What rules have you put in place to ensure that it doesn't become a pig-sty, or are they good at regulating this themselves? I'd be particularly interested to hear from those who introduced it later on as well.
For those who say 'leave them to it, it's their own space', well, I can't. We live in a flat and the rooms are visible enough, as they all lead off one hallway. Plus, it's Georgian, so although we haven't had any mice visiting for quite some time (ironically better since our cat passed away!), it's certainly not unheard of.
No judgment please. As I said, I wish I had done this long ago. But I'm a single mum of three who works full-time and is doing her level best 
Thanks.