Though it can be a frustrating experience when the trusted kitchen sink sprayer suddenly stops working, you may find it is easily solved by cleaning it. Even if it does work, it's still prudent to know how to clean your sprayer to keep it in good working order.
Step 1: Dismantle
There are many points within a kitchen sink sprayer where mineral deposits and debris can build up, so take it apart to gain full access. Use a wrench to unscrew the base of the hose from where it joins the sink. It should be possible to remove the spray head by hand to access the aerator.
Step 2: Soak and Scrub
Remove the diverter from its sink recess and soak it in the cleaning solvent that you're using, along with the aerator. For stubborn deposits, use a stiff bristle brush to scrub the components. This method can also be used on the threads of the nuts.
Step 3: Reassemble
After rinsing the components in clean water and drying with kitchen paper, return them to their original position and your kitchen sink sprayer is ready to use.