MF3D button sticking

[lifeinUV]

One of the arcade buttons on my mf3d is sticking slightly, still triggers ok but feels like there might be a speck of dirt or something blocking it from springing back in place when i press it. does anyone know of a way to clean that sort of thing or fix this without sending it in for repair?

[funke]

Pour some alcohol into the button, then blow it out with an air compressor.