Paint brushes
I am a retired custom home builder, we did it all. This past weekend I was cleaning out my shop and found an old stiff purdy brush, the tips were ok, but you could not bend the bristles half way down, caked with old paint residue
Instead of tossing it, I decided to rejuvenate with 1000+
All I had left at the house was some diluted (3-1) solution, so I laid the brush in a tray and sprayed it down good, letting it sit for a couple hours, while adding sprays on occasion.
The brush was completely rejuvenated, soft and pliable bristles top to bottom, and this was with diluted product.
These brushes are expensive, and we used to clean them and rub them down with lanolin soap, but 1000+ seems to do just fine.