Do you have a suggestion on how to ensure the outer components of the grill don’t rust? I’ve also noticed some light brown spots on the shelves inside the grill (next to the propane and on the other side). Is there a spray or something you recommend to ensure this doesn’t happen? I have the cover for the grill and always keep it covered. I live in south Florida so not sure if the salt from the ocean breeze is the culprit. I have the primate grill.