I did this several times, and what worked on the successful attempt was to engage the valve partially, creating a slow trickle of the cold liquid. I placed the

I did this several times, and what worked on the successful attempt was to engage the valve partially, creating a slow trickle of the cold liquid. I placed the end of the tube to the wart, and let the liquid pour over it until it visibly turned a lighter shade (presumably from freezing). The previous times, just a few drops was not enough to achieve this. The challenge was to balance the valve just the right amount so that it doesn't overshoot the affected area.