What kind of cleaning is this (for search engine purposes)?

So there is a house which is an absolute tip. Things have been left for years so there's a whole load of crap everywhere.

What I'm after is someone to come in and sort through it all whilst being able to pick out (with help) the things which need to be kept.

I've found some services for the cleaning side which will need to happen after. I've also found places to remove the goods once you've sorted them...

It's a job too big for me and other than pointing out what's to be kept, I don't want to be involved in the work of the de-clutter.

Can anyone help by telling me what a service like this is called? I know it exists!

Many thanks