If your sign, poster, banner, or vinyl window cling becomes dusty or dirty, gently wipe it with a soft, damp, lint-free cloth. Avoid applying pressure, as it may scratch the surface. Do not use alcohol, Windex, solvents, or chemical cleaners—these can damage the printing or finish. To avoid water damage, use a dry, lint-free cloth only for posters printed on paper or rigid signs with a paper face.