Ok, I created the reset link and the session variable. I then opened the WebAssist > Cookies > Clear Session Values.
For the Trigger I clicked the lightning bolt and under URL I choose "reset"
I unchecked the Clear All session variables and choose the session variable in the list that I created and click OK.
Now when I click on the Clear Search link all it does is clear the search fields. It doesn't clear the search and show all records again.
I also tried it with a reset button, but the button doesn't even clear the search fields.
I would much rather it work with the button, because the form would look much better.