Pull the handle on the tank lid up, then push down. Pull the handle and tank away from the Hoover steam vacuum.
Transport the tank to a faucet. Remove the fill cap from the tank.
Turn the fill cap over. Note the fill lines on the side. The lower line measures 3 oz. of liquid. The upper line measures 5 oz. of liquid.
Pour the proper amount of detergent into the cap. For carpet and bare floors Hoover recommends filling the cap to the upper line. For upholstery fill the cap to the lower line.
Pour the measured detergent into the tank.
Turn on the water faucet, and allow the water to heat. Fill the tank with hot water up to the fill line at the side of the tank. The fill line measures 1 gallon of liquid.
Replace the tank cap. Reinsert the tank inside the Hoover steam vacuum. Press the handle back toward the vacuum until it snaps into place.