Enjoy your RV. Leave your sensor probes to us. Unique Restore-It's specialty formula targets and eliminates the waste in your black tank that causes sensor misreads and malfunctions. Sensors begin to misread when waste gets stuck to the sensor probe, confusing the system so it thinks there is waste in the tank, when in fact there isn't. This problem can happen with all types of sensor probes. Even the "probeless" systems can misread when waste accumulates on the tank walls! Restore-It is the strongest, most effective black tank sensor cleaner and restorer on the market (formerly sold as Unique Sensor Cleaner)! Each bottle contains two uses, and after one or two cleanings, you can enjoy properly reading sensors again. There are a couple of things to know as you get started with Restore-It: First, sensor cleaning can be a little tricky sometimes, but our customer support team is here to help you successfully restore your sensors. We've helped thousands of RVers solve this problem, and we'll help you! Second, Restore-It cannot fix broken sensors, so if your probes are unable to be restored, it's more than likely because they need to be replaced from age, damage, or malfunction.