Over the years I have collected the most beautiful brushes made from sable and badger hair, and even hog and good synthetic hair too. Each brush is unique and performs a different task and with the time I spend painting the last thing I need is hair that breaks off and sticks in the layers of my paint, or tiny stray hair poking out at all angles sending the brush to the fuzzy-tip tin.
I found the solution to be inexpensive cooking oil, the canola oil I fry my fish tacos in (Yes you can recycle your cooking oil for using it for brush cleaning). My brushes have never been so supple and clean so I would like to pass this onto everyone it's a marvelous solution.
At the end of each day before leaving the studio we clean-up our wood palette with linseed oil and then cover the remaining palette paint with plastic wrap so its good to go again the next morning.
With the brushes, I swish them around one by one in a container filled with conola oil, wiping off the oil paint on a paper towel is easy after that, then using brush soap or regular ivory soap I wash off the conola oil under very warm water making sure you take the time to thoroughly clean them, I usually have a glass of wine to sip on the side.
Dry them by squeezing out the water first with paper towel then tear off a strip of dry paper towel and wrap around each individual brush end giving the top a twist to hold it secure. The brush will dry staying in shape and feel soft and springy like new the next day. If you don't have time to wash your brushes straight away or you forget, leave the brush tips in the non- drying conola oil in a tray until you can get to them.
A solvent free solution that works beautifully, Thanks George of Natural Pigments for the tip!