Are you tired of seeing all those PRC pros walking around your neighbourhood?
Since it is difficult to get rid of the "supply" side of the equation, ie difficult to distinguish between real tourists vs hookers, perhaps it is better to tackle the issue from the "demand" side of the equation.
How? You may ask.. Here's how. Get the press and tv news network to accompany the anti vice in their raids on KTVs, kerbside, massage centres, and motels. Be sure to capture the faces of the male clients in the pictures and film. Publish the pictures of these male clients in the press who are rounded up together with these freelances.
Soon, like parking in handicapped parking lots, the "demand" will disappear!