I am going to DParents House .
Wish me luck, it is a trial of endurance .
DMum has things I try to evict each time , she says "No I'm going to sew that" , they will still be there , unsewn .
Two years ago she had a load of material that she said was going to be sewn into a coat. I gathered up all the bits put into a clear lidded box and she agreed a timespan ( two months) she was going to sew it .(or she would get rid of it)
Still not done , I need to find the box , she probably shoved it in a cupboard so she won't miss it .
And she keep boxes and plastic tubs to keep "things" in ( wrappers, used envelopes ) I recycle and get rid of the boxes too.
It is like dealing with a toddler , it is all negotiation.
She always agrees her room is nicer when the way is clear to the door ....but within 24 hours , the clutter is back, ready to trip her up. 
I might keep a record , photos on my phone