To clean your electric baseboard heater, start by turning your thermostat down to zero to shut off the device completely. Wait until its elements completely cool down.
Next, remove any large, visible debris from it by hand.
Lastly, simply use your vacuum’s soft brush attachments to suck up any crumbs, dirt or other materials that may have drifted in over time. If you’ve got time to spare, you can finish off the project by wiping down your heater’s surface with a damp cloth, leaving it dust-free and good as new.