It is simple to clean oil brushes without solvent. Use safflower oil instead and use a rag to squeeze the bristles until all the colour is gone. Then use a brush soap to clean the oil out. Read more about halfway down in this article:
What is the best way to clean an oil brush without using solvents?
What is the best way to clean an oil brush without using solvents?

Written by Jackson's. Updated over a week ago
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