If you have a nearly full aerosol can that won’t spray it is not only frustrating, but it is wasteful. The clog is likely due to gunk that lodged in the nozzle that prevents the liquid from escaping. Here’s how to fix this: turn the can upside down and dip just the nozzle in a small bowl of rubbing alcohol, wait about one minute, then rinse under hot water. The alcohol will dissolve the clog so you’ll be spraying in no time.