Pondering this thought after reading another thread which reminded me.
My mum and stepdads house was very cluttered growing up. Not hoarded, just cluttered. My mum smoked inside the house too so it stank. They weren't the type to spend any money on aesthetics if it wasn't broken. So they wouldn't buy new curtains if her old ones were undamaged or new carpets/sofas even if they were worn out/haggard unless it was broken. So the house was very mismatched as they would replace things when needed without thinking if it was matched.
To clarify we werent particularly hard up for money or anything, it just wasn't a priority to my parents I don't think.
Although the basics were done such as hoovering and wiping down the sides. We NEVER deep cleaned such as dusting, pulling out sofas/microwave/cleaning windows or cleaning skirting boards etc.
When going to friends houses there was always a stark difference. All their houses were cleaned well with soft furnishing and the decor matching. None of their houses stank of smoke. No matter what kind of style their parents had they obviously carried out home improvements. Im assuming if they ever came into any kind of money such as a work bonus or inheritance or something they would use it on home improvements such as decking in the garden or a new kitchen etc. Whereas I don't think it would even cross my parents mind and instead they'd spend it on a holiday or car or something.
The houses all felt like show homes!
Now I'm an adult I realise they weren't emmaculate show homes at all, just that most people enjoy living in a nice home free of clutter and smoke!
I would feel quite embarrassed having friends over after seeing their homes and wonder what they must have thought! The funniest thing is... my mother believes she's house proud! 
I've always wondered if anyone ever felt proud of their homes?! Knowing they were lovely and cared for? Or did most kids just not ever think about it as they lived in nicely decorated houses similar to their friends so it wasn't an issue?
As an adult now I have to write a list of deep cleaning things to do every now and again and put it in my diary like cleaning behind the microwave or cleaning the fridge and cupboards. As I didnt grow up doing it, those things don't come second nature!