Somehow, they go from extreme hoarding. Over whelming garbage to clean & uncluttered. Hoarders have OCD compulsive behavior. They can't suddenly clean up tons of trash in a few weeks.
From what I kniw, there I'd medication for OCD that might help reset the brain.
These hoarders are often really nasty and I think borderline personality disorder. They focus on saving items worth a few 100, when they are facing eviction & lose of everything. They need everything. Ignore rat crap & collect urine in bottles.
On Hoarders, they use $100K of help for 5 days. HOARDING. They don't always show the clean-up. It takes teams of 20 with shovels to clean up tins of garbage.
Box of cellphones, even if they work, become outdated & inadequate.