Can you clean the air intake on a solenoid valve?

Yes, you can clean the air intake on a solenoid valve by following these steps:

Unscrew the fittings from the solenoid valve, ensuring you keep track of how all parts fit together.
Use a cotton swab and clean water to clear any debris, rust or dirt from the air intake, around the o-ring gasket and from the magnetic plunger.
You can take this opportunity to inspec the rubber pad at the end of the plunger. If this is dented or damaged, it may not form a good seal, causing your valve to leak. This part is tricky to replace, and you may need a whole new solenoid valve