@AgitatedGoose that sounds hard. I can understand wanting to keep minimum standards in the house and garden, but honestly you’re just making a rod for your own back by stepping in and doing it yourself.
My parents used to keep their house and garden absolutely immaculate and it makes me weep to see it now. The wallpaper peeling off the dining room ceiling where mum let a bath overflow upstairs absolutely kills me. Dad would be apoplectic. But the house is sound, safe, secure, free of damp and pests, and the kitchen and bathroom and her bedroom are basically clean. I have to ignore the dust, cobwebs and general grimyness elsewhere as those rooms aren’t used any more. It’s been a journey to get to the point I can do that but it was physically impossible to try and maintain it to their previous standards and retain my sanity. Luckily mum agreed to a gardener who keeps things tidy outside, although of course I have to manage him.
One of the silver linings for mum taking to her bed and leaving household management to me is that when the mood and energy take me, I tackle one drawer or shelf in a cupboard per visit and nibble away at sorting things out (keep/bin/recycle/donate). I’m motivated by seeing DH sorting his mums house after her recent death, and he’s not only got her clothes and belongings to deal with, but his aunty and his grandmother, who both used to live in the house too. MIL wouldn’t give the clothes to charity because she didn’t want to see other people wearing them as it would upset her. But she didn’t even deal with their underwear! It’s all a bit TMI for poor DH…
One tip I can give is when you come across an item that is sentimental but otherwise no use to you, is to take some good quality photos of it and then it’s easier to dispose of it. You still have the memories, but not the clutter.