Clear Previous Cache Data Of AutoComplete

Hi. I am using JQuery Ajax AutoComplete, and I register the method on an HTML Input to search in two tables according to selection of a HTML Select. My problem that when I register autocomplete for the 1st table it works well, but when i select the 2nd table it caches the previous data of the 1st table and it makes autocomplete for the 2nd select filters in both "table 1 + table 2" , I tried add property of nocache : true but i get the same result it caches previous search values. so, How can i achieve that autocomplete for every specific select.