Bissell steam cleaner will not spray shampoo

My Bissell stops releasing shampoo when the handle is lacked upright, when there is no water in the tank (the most common cause of this issue), or when water is not flowing through the machine because the sprayers are clogged.

Make sure the shampoo container grommet is releasing properly when you press the trigger. To check this, remove the shampoo tank from the Bissell, stand over a sink, and use a finger to push up inside the grommet on the shampoo container, the part of it that mates with the rest of the Bissell. Shampoo should dribble out when you do this. If it won't, the grommet may be clogged.