What Not to Clean With a Steam Cleaner: Key Risks

Do not use a steam cleaner on materials that can warp, discolor, delaminate, or lose protective coatings when exposed to high heat and moisture. Avoid unsealed wood, delicate fabrics, porous stone, electronics, cold glass, and surfaces secured with heat-sensitive adhesive.

Unsealed hardwood, waxed wood, laminate, cork, and some luxury vinyl flooring can absorb vapor through seams, causing swelling or separation. Check the flooring manufacturer’s care instructions and test a hidden 1-inch area before cleaning any floor with steam.

Steam can penetrate unsealed marble, limestone, concrete, and terracotta, potentially leaving stains or weakening sealants. Painted, lacquered, antique, or wax-finished surfaces may also blister or dull, so use a pH-appropriate cleaner and a soft microfiber cloth instead.

Never direct steam into outlets, switches, control panels, screens, keyboards, or appliance vents. Unplug compatible appliances before cleaning their exteriors, apply cleaner to a cloth rather than the device, and wait until every surface is completely dry before reconnecting power.

Silk, suede, leather, velvet, and non-colorfast upholstery may shrink, stiffen, bleed, or develop water marks. Steam can also loosen wallpaper, flooring adhesive, veneer, and glued furniture joints; check the care label and choose professional cleaning when the material is marked “dry clean only.”

Do not steam cold windows, mirrors, thin glass, or cracked surfaces because a rapid temperature change can cause breakage. Hold the nozzle at the manufacturer-recommended distance, keep it moving, and review the complete steam-cleaning safety guide before treating an unfamiliar material.