The tablets containing aldehydes and chlorine used in the market before have a strong pungent smell, and the liquid medicine is not easy to wash and affect the taste, which is easy to produce nausea and nausea. The scale and heavy metals in cans are difficult to wash out, which are rejected by consumers and eliminated by the market. On-site cleaning service means a huge market and a godsend opportunity. We are about to start a marketing revolution of door-to-door cleaning of water dispensers. We want to subvert the traditional cleaning mode of drinking fountains and bring brand-new services to users of drinking fountains nationwide! This is bound to cause a great sensation in the market! And bring unexpected benefits to the majority of small and medium investors.