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Use a wire brush to remove paint from bristles
Next, hold the brush under running water. Run a wire brush (or a kitchen fork) down the bristles to remove dried paint. When the water running off the bristles turns clear, the brush is clean.
Let each paintbrush air dry, then wrap it with the cardboard cover it came in or heavy paper (like grocery bag paper). To keep the bristles straight, hang the brushes from a nail or hook, or store them flat.