I have a self-service washing machine for online payment, which can improve the level of business hotels, but I don't know how to contact some big hotel chains.

Hello, we have many here. I have also worked in schools and community property. To be honest, this thing is not practical because many clothes can't be washed at the same time. If someone else washes it, I can't. The last thing is broken, and the capital has not been earned. I suggest you don't even think about it