I have had a couple of good natural bristle brushes for several years. I've been careful about cleaning them until now, but a couple months ago I left them in a jar with water "to get back to tomorrow." Today I finally got back to them and as you can imagine, they aren't in great shape. Is there any way I can restore them or do I have to throw them out?
I use a product by "Clean Strip" called roller and brush cleaner. It usually works well even on badly hardened paints. Word of caution however, try to use it outdoors as it really has a lot of very offensive fumes. Also wear plastic gloves as this stuff will burn your hands. Heed all the warnings on the can, this is nasty stuff, but works well.
Hot vinegar seems to be working but I caved and bought a new one anyway.
Soaking brushes in Lestoil softens them up and you can wash with warm water. Don't for get to block with newspaper to keep their shape!!! Doesn't work on polyurethane harden brushes!!