Bins are always an issue, esp if you have a range of folks who don’t care or are not aware of local uses. We always have overseas kids unaware of what each colour bin is purposed for. And then when they leave they tend not to be aware of the limits acceptable and don’t know about using a local tip or how they’d even get there or what that may cost. They place stuff there, it disappears, so what’s the problem? Rinse and repeat.
Even if you know the culprit its usually best to send a notice (repeated as regularly as required) to all units saying the same thing, that way you aren’t seen as going hard on anyone particular. And if folks know, and an offender is aware in advance it allows you to remove inappropriate stuff like furniture and remove it back to where it came/place it in/outside their garage which will let them know they need find another avenue.
As for sorting recyclables into the correct bins, good luck with that and you should do it yourself should you want but you can’t really force anyone to do so.