Hello TTS company, I bought your products TTS 10, TTS 20 laser equipment and I also bought a 600x600 kit. It works well, but why haven't you made a video about cleaning the lenses of the TTS 55, TTS 10, TTS 20 models after using them for a long time? This causes great inconvenience to laser users and damages the equipment. Therefore, please make videos about cleaning and replacing the lens parts of laser models. It would be good and very useful for many people.