Remove any obstructions from the accordion shutter tracks. Wasps and hornets often build nests in the upper tracks of accordions. Remove any nest from the tracks using a screwdriver or other device.
Spray all wheels and slat pegs generously with a liquid silicone spray. Open and close your accordion shutters several times to allow the silicone to penetrate wheel bearings and other moving components.
Spray the shutter's lock and exterior lightly with lubricant to finish each shutter. This adds life to the locking device and ensures it will be in working condition when needed.