(this is a long one) The laziest tenant ever to have lain on a sofa will no longer be gracing our property as of next month. We're talking 10 years of filth- should have been evicted but the dirt was tolerable until last year, when tenant's relative (who was clearly doing all the cleaning) died.
Tenant has now decided to up sticks and leave us with the mess ( bc we cleared up her chaos thoroughly one time a few years back).
We're talking living room and hall (only area we've been in until recently) more or less empty, but (huge) laundry room turns out to be 2 foot deep in rotting discarded clothes, (inc. pair of undies which ripped up the lino as I tried to bin them- stuck to floor with brown substance...) whole kitchen is covered in the remnants of what looks like every takeaway since the London Olympics. Tenant has a bin and chooses not to use it.
adult child [now moved out] has been in trouble with the po so god knows what we'll find in the bedrooms. 
We'll clearly have to gut the place, new kitchen bath floors etc.
There are also myriad cats and a dog running about, so needless to say the smell of them and ciggie smoke hits you like a brick wall. Even after painting how the hell will we get it habitable again??? Need the money so want to get this done in one take. Tips please.
PS. Don't give me some guff about pitying the poor creature's hard life, 40-something tenant was privately educated, is clever to the point of stacking history books around the house, socially functional (if smelly) and yet has chosen not to use the bin outside her door.