Answer:

If the lamp is normal, just close the exhaust gas source, open tube 30-60 minutes, and then cut off the power supply, and wipe it by cleaning cloth with some active diluents on surface. If the tube is damaged, the adhesive paint glue is impossible to wipe out. The reason is that UV ultraviolet light can gradually decompose the paint and glue (organic matter) attached to the wall to form a non sticky powder material, gently wipe to get rid of it.