Airbrushes need to be cleaned after spraying for several reasons:

Clogging: When paint or other materials are sprayed through the airbrush, small particles may get stuck in the nozzle or other parts of the airbrush. Over time, this can lead to clogging and affect the airbrush’s performance.

Color mixing: If you are using multiple colors or types of materials with your airbrush, not cleaning it properly between uses can result in color mixing. This can result in unexpected colors and patterns in your artwork.

Preventing corrosion: Some materials used in airbrushing, such as paints and solvents, can be corrosive. If left in the airbrush for an extended period, they can damage the internal components of the airbrush, leading to malfunction or reduced performance.

Health and safety: Certain materials used in airbrushing, such as solvents and chemicals, can be harmful if inhaled or come into contact with skin. Proper cleaning can help prevent the buildup of these materials, reducing the risk of harm to the artist or anyone else in the workspace.

Overall, cleaning your airbrush after each use can help ensure its longevity, performance, and your health and safety.