I was brought. Up in a messy. House.
I HATED IT. I could never take friends back. And the worst of it was, when I left home at 15, I literally had NO clue 'how' to do housework.
I didn't KNOW that you were meant to clean a toilet. I didn't know how often you should wash up - so I would use all 4 plates, then all the saucers, then all the bowls, before washing up. Bearing in mind I was living alone, so the first plates would be mouldy by that point.
I had no clue that you could clean floors, much less that you were meant to. I couldn't remember the last time I had seen a Hoover used at home, so assumed it only needed to be done before people came round...
It's taken me YEARS to get into any semblance of a routine with housework, and yo get organised and to stop hoarding except birthday and Christmas cards, but they're in boxes in the loft.
I'm far from perfect - even after 17 years, it's a work in progress, which is hampered by my failing health and my crafting...the sheer STUFF you end up owning as a crafter who does multiple crafts is immense! That and books...
My house is filled to the brim overflowing if I'm truly honest - but I do a 6 monthly 'hoarder check' to throw away broken things, donate outgrown clothing to the preschools and the refuge, and sell other stuff on EBay. That helps keep my genetic hoarding tendencies to a minimum (I'm the fourth generation AT LEAST like this, and my Granddad claims to have memories of HIS grandparent's house being somewhat...crammed...with stuff).
I am still improving, and my washing up never sits for more than 36 hours now, no matter how bad my health is that day. My clothes are clean, if not always put away, but I have baskets they are piled into put in in the hallway.
Floors are clean now etc.
The turning point was a SW as mentioned up thread giving me 4 days to get my house spotless due to 'faeces in the toilet' which was misspelt as 'faces in the toilet' in the report, which I still find hysterically funny. The SW refused to believe that I had JUST cleaned the loo before her appointment (even DS2 told her, as HE was the one who had just pooed!!).
I too had stuff on every available surface. Now I allow my bedroom to be like that, but not the shared bits of the house. Front room toys are packed away daily, floor hoovered (table in front room), washing up done most days, floor mopped in kitchen every few days, bedding changed once a week for everybody, on a rota. And even my room isn't 'messy' or 'dirty', it's just very cluttered as it's a bedroom/craft room/personal library/study area for my College work all in an ordinary sized dining room...
Th biggest helpers were the motto 'never leave a room empty handed', finding out how often 'normal' was for each job threads on MN help me to constantly adjust that too, buying the right storage, having a place for everything, and doing my 6 monthly 'anti-hoarder' clear outs.
My DC's don't live in a show home, far from it, but they CAN bring their friends home without feeling embarrassed, it's cluttered but clean, and organised chaos rather than chaotic organisation...
I think personally that even by my standards when they were at their lowest, and I was potentially going to have my DC 's removed if the house wasn't tidied up in 4 days, this friend's house sounds, well, rank for want of a better word.
And it takes a right shithole for me to think or say that, given I WAS brought up in utter squalor.
This friend needs to do something. If the house smells, and guests are hovering over the loo rather than sit on it, and are avoiding eating there, then the untidiness has crossed a line into truly minging IMO & IME. Tbh with chicken poo in the kitchen, I can see why the other. 'Friend' who has the anger issues over a messy house needs to evaluate HER issues before starting on anyone else.