The grates are porcelain coated, so not much of anything in the way of maintenance there. No need for Pam, and Pam can cause a weird build-up on porcelain, so I’d avoid it.
Just fire and heat your grill for 5-10 minutes then scrub the grates with a nylon grill brush. That’s it, they’re ready to cook on.
There is a grease drip port underneath, make sure to keep a catcher in it. Dump the catcher every week or so.
As for cleaning, the heat of the grill will ash the fats that drip, and those that don’t ash will drip to the catcher.
It’s a very easy grill to maintain. Once every 3 months (once a month if you’re anal like me), pull the grates off and soap them up (in the bathtub is easiest) and cleanse with a nylon scrubby. Then use a wooden spatula to scrape the insides of the grill and push all the ashed fat down through the catch port into your catcher.
Very, very easy grill to maintain. Good score!