DS is 13. When he's not at school or playing football, he's in bed, curtains closed, playing on a device of some sort/eating, surrounded by a sea of dirty crockery, apple cores, sweet wrappers and a mix of clean/dirty clothes.
I've banned him from eating upstairs but he sneaks food up there when I'm out. He has a laundry basket, which he uses like a basketball hoop. He's responsible for his own laundry but despite constant reminders he does stupid things like washing all his school uniform at 10pm on a Sunday night, meaning none of it is dry for the next day.
I open his curtains and windows while he's at school during the day to get some air in and make him clean up every few days, with much growling and complaining from his end.
My go-to punishment is to confiscate his devices, but his school has a compulsory Chromebook scheme so he has to do his homework on that. The nuclear option is threatening not to take him to his football match the next weekend. That does get him moving so I haven't had to follow through on that yet, but I would.
Talking to him, reminding him and helping him has no effect other than making him even more grumpy. We had MIL to stay a few weeks ago so I gave his room a deep clean to make it suitable for DD to share for a night. Two days after she'd gone it was back to being unfit for human habitation.
How do people successfully train their teenagers to live in a reasonably clean and tidy state?