Filling Clean Water Tank | How to Videos | SpotClean/Little Green Pro Filling the clean water solution tank is an easy process. We’ll show you how. To remove the tank, lift it straight up and pull away from the unit Pull on the black tab to reveal the tank opening. The plug rotates out of the way for easy filling For large messes, follow the fill lines on the clean tank to add the correct amount of hot tap water, portable machine formula, and 1oz of Bissell Boost. The same applies for smaller messes. Just follow up to the appropriate fill line. Replace the plug by rotating into place and pressing gently onto the tank Replace the tank by lining up the tank bottom with the indentations on the machine. Press down firmly on the tank to assure it’s in a secure position That’s it! Your SpotClean Proheat clean water solution tank is now full and ready for use!