Our Doxirobe gel (Pfizer Animal Health) needle applicators kept getting plugged when we administered the gel over several days. But then I discovered a way to unplug them. With the dental machine turned on, I put the tip of the air-water handpiece into the applicator and sprayed air through it. The gel sprayed out both ends, and the applicator was completely clean and ready to use again.
Trenton Oberly, veterinary technician