The application of dark wash to panel edges has been allowed to dry for at least 15 minutes. You can see from the photographs below that the colour has lightened and the white spirit has evaporated.

To remove blobs and other unwanted paint after application surpluses, I use the rigger brush dipped in clean white spirit and gently lay the bristles as flat as I can against the areas to be treated. By moving the tip of the brush around, I can absorb the only-just-dry paint from the appropriate areas, leaving just the panel edges discoloured with dirt.

With each portion treated the removed paint is immediately removed from the brush by touching the tip to a paper towel.