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You need to wash brushes with soap and water following any cleaning method. Regardless of the solvent. It's like rinsing out your mouth with water after brushing with toothpaste.
I find a big difference between walnut oil that is used for cooking and walnut oil cold pressed for painting use. The cooking oil is thicker and the paint sludge doesn't settle to the bottom of your cleaning bucket. I don't like olive oil as much as the M. Graham and Co. walnut oil.
Using anything to clean brushes during painting will be added to your paint. Linseed oil makes a stronger faster drying paint film than walnut oil. The reason you see many brushes in the artist studio is because a fresh brush should be used for a fresh color mixture.
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