How do I ensure that the brush hairs return to their intended shape after washing?
After cleansing the brush, press dry it using the microfibre cloth or a towel, and then use your fingers to gently re-shape the fibre bundle to an approximation of the original shape, if needed. This shape will then be maintained during drying and the brush will be in good shape for application.
Should your brush accidentally get deformed from odd storage, you can generally revive the shape by dipping/swirling the fibres into hot water for a minute or so. Or pass the tips of the brush through the steam from a fabric/clothing steamer. The heat of the water or steam will cause the fibre memory to activate and the fibres will likely return to their original shape.
Let brush dry normally before reuse.