Yes, you need to clean your helmet to remove all the dirt and scum that might obscure your view. Use warm water and shampoo for the procedure.
Start by cleaning the interior.
We recommend wiping the helmet with a dump cloth if you own an electrical model.
Do not immerse the equipment in water as you might damage its electrical parts.
Once done, leave it outside in an upside position to dry. Store it in a cool, dry area free from chemicals that degrade its performance.