What should I do if my newly posted couplets are almost all unlocked small advertisements?

Wash it with a strong advertising cleaner first. If it is a commercial community, you should talk to the property and unite with other owners who have the same troubles. If it's a family hospital or something, it's probably hopeless ... is there an access control system in this situation? If not, install it to the property or community management department through the owners' meeting. If there is access control, why not just find a place on the wall to paint it, write a small advertising poster, and alleviate the phenomenon of posting small advertisements around the door ... In short, if none of the above works, just post Spring Festival couplets for a few days and then withdraw. I hope it works for you.