Goodluck Richy,
the problems are still the same but on a bigger scale.
Guarenteed you can clean an apartment block and someone will complain, you are not in a position to argue even though you know you have cleaned them properly.
First time you start a fuss, you will be long gone, trust me.
From the posts that i read from you i think you are complicating yourself bigtime and causing yourself problems.
Why dont you pay someone more than normal to look after your work (you will get someone if you pay very good) and they can have the hassle and running of your business (divert al;l calls to them).
Take a month out to sort your head out, and work out a strategy and basically set up again so you have nothing to do with your domestic apart from turning up now and then just to see it ticking over properly.
But do not think commercial and apartment blocks are easier because you are stupid to think that.
Like someone said, if your domestic doesnt pay, you might be waiting or lose £10 or £20.
Apartment blocks can be in the hundreds, same problems but on bigger scale.
Only my opinion as i have been doing this for past 27 years