-Your Shark Professional 2 in 1 Steam Pocket Mop is designed to clean surfaces that will withstand high heat and moisture. Do not use on unsealed wood surfaces (especially wooden antique furniture), unglazed ceramic tile, painted surfaces or surfaces that have been treated with wax, oils, varnishes, or shellac. The sheen may be removed by the heat, steam, and friction of the cleaning tools. Lacquer and polyuretane coatings provide a hard durable protective finish that withstands moisture, but it is always recommended to test an isolated area of the surface to be cleaned before proceeding. -We also recommend you check the use and care instructions from the surface manufacturer. -When cleaning finished wood surfaces, use broad, continuous strokes. To prevent damage, avoid focusing steam or allowing the cleaning tools to sit in one spot for any amount of time.