In an effort to reduce toxic products from my studio. I have replaced cleaning my brushes with Safflower oil instead of Mineral Spirits. Safflower oil I purchase from the grocery story.
I use 2 Salad jars, one filled about 1/3 with Safflower oil to clean the brushes initially. With 2 I can settle the paint in one jar when it becomes too dirty to use. Takes about a week before I can decant the oil off and throw out the paint sitting at the bottom. After the initial brush cleaning I use a paper towel to remove the majority of oil and paint.
I store the brushes laying them in a paint tray with a mix of Safflower oil and 10 drops of clove oil. Before painting I wipe the brushes thoroughly with a paper towel to clean off as much of the Safflower oil as possible. Do not want to mix any Safflower oil with the paint.
Safflower oil is a non drying oil and clove oil slows the oxidation of paint. The brushes can last for months stored in the Safflower oil and clove oil. This is a new step for me so I cannot say how long but I have read of brushes stored this way indefinetly.