In computer maintenance the dampen material can be used on the following devices except

Dampen material is typically used to clean electronic devices without causing damage from water or other liquids. Therefore, it is generally safe to use dampen material on keyboards and mice, as these devices can get dirty and require cleaning. It is also safe to use dampen material on screens, as long as the material is not too wet and is applied gently to avoid scratching the screen. However, it is not recommended to use dampen material on DVD lenses. DVD lenses are sensitive and can easily be damaged by liquid, including dampen material. Instead, specialized cleaning solutions and tools should be used to clean DVD lenses. Therefore, the device on which dampen material should not be used is DVD lens.