One thing to take note is that people will only pay if the work is absolutely a challenge where they can't do themselves. It would be absolute filth.
Found this interesting article while looking for a business / person who did this a few years ago on the Southside. (Will post the article if I find it..)
Was going to suggest that you also consider that you might want to partner with someone who can help with some redoration (space saving furniture / organisational thingys / brightening up the room etc) services to complement and provide a longer term solution than a one time clean up.
https://www.scmp.com/news/hong-kong/...flats-all-part
There you go .. found it.
https://geoexpat.com/forum/53/thread351627.html
Id pay for someone to pack up all my shit if i was ever to move flat, or do the removal companies do that for you?