The operation of the pump spray bottle depends on a spring-loaded plastic piston operated by a trigger or vertical pump mechanism. When the trigger is pulled or the pump is pressed, the piston forcibly ejects the fluid in the piston cavity through the nozzle, which is usually equipped with a tightening adjustment cap. After each spray, the piston automatically retracts, creating a vacuum in the chamber, which draws more fluid from the bottle through the tube. If your sprayer does not work, it is because the nozzle is clogged, the piston seal is damaged, or the inner tube is not immersed in liquid.
If your spray bottle contains oil or other substances that may harden (such as hair spray), you may have to clean the nozzle regularly. Before doing this, turn the nozzle a quarter turn counterclockwise to loosen the nozzle cap, and then try to spray again. ... if your bottle contains hair spray, soak the nozzle in alcohol.