Teenage rubbish

Looked down the side of teenager’s bed this morning and pulled this lot out…. There is even a bin in her room (empty as you might expect!!)

Parenting advice required: when does the apparent disregard/disrespect for surroundings stop and when does the one word grunts for responses stop..?

Harry Enfield’s Kevin the Teenager was absolutely spot on…! :-(

Answers on a postcard please!