In Shanghai a few years back the street hawkers were something to behold.
It's the most aggressive selling on the globe. After a few days dodging and fleeing, you develop your own aversion tactics and escape routes (difficult with such a wealth of humanity).
Our Kiwi guide suggested we forcefully voice "Bu yao", which is a slightly rude way of saying "Don't want". It sometimes worked.
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But the best technique was to pretend you didn't understand their pitch or pidgin English.