I'm horrified at the mess, inconvenience and lack of responsibility taken by your teens in parties Mr C.
Admittedly my friends and I tended to have our parties in the absence of parents due to my ex's parents living in Hong Kong 9 months of the year, Friend B and my parents being away a lot. But in many ways that meant we felt we had enhanced responsibilities to setup, not piss off neighbours, not break valuables and tidy up after. Valuables moved to nogo zones. Friends had tidy houses which had to be restored to suitable spotlessness, ex's house got vacuumed before cos shithole.
There was always a core of 4-6 of us at least who set up and tidied up afterwards. Sometimes ppl had to piss off early the next day cos strict-parents, religious stuff or jobs but we always made sure there were several tidiers "before parents came home". Bottles went into one bag for recycling, cans into another for recycling and binbag for the rest and put outside ready for bin day -- the morning after. I don't remember making hideous mess although probably would have tidied at 'endish' of party if the family were around. We also washed up/dishwashered, wiped up, vacuumed inevitable crisp crumbs and stuff. Took less than an hour cos we'd all help.
We also bought our own food, I made my ex bring double cos he ate so much and we had a policy of not leaving people out of food or pocket, especially as some of us/families did not have much money to spare.
