Good idea because a clear film can be on it and you might not be able to see it unless you hold it up to the light. If so, you might be able to clean it with Berrymans Chem Tool or some other good carburetor solvent. You can also screw the needles out and remove the diaphragm and needle on the other side and give the carb block a good spraying down with the Chem Tool. This will help dissolve the gum in the carb. Be sure to do this with good ventilation.

Be real careful with the screen because it can disappear in a heart beat. Ask me how I know.