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Dab a tiny drop of petroleum jelly over the pinhole opening of a hairspray pump. It prevents residue from gumming up and rendering it useless. This also works for spray starch.
By fossil1955 from Cortez, CO
Hairspray cans always clogged? What a waste. Such an easy solution!
After you spray your hair, run the nozzle of your spray under water for about one, (1) second! Then swipe it across a dry towel, and it will never clog again. So easy, so fast, you are out the door.
If you have the a pump spray that has been clogged for awhile, stand upside down in a container of alcohol or hot soapy water for awhile. After you un-clog it, do the same as with the spray can after every use. It won't clog again.
Source: I am a retired hairdresser