But anyway, the best maintenence you can do to your grill is AFTER you use
it. Clean it when it is still warm, and as soon as it cools, empty the
charcoal/grease catch, and spray down the grills/grates/burners with a
little (spray can) vegtable oil. I use oven cleaner once a year, and give
'em a good power wash inside and out. A good cover is a must as well, when
not in use. My 22" is over 10 years old, and still looks almost brand new.

I will atest to that. I mentioned earlier in this thread that I have
had a Weber Genesis Silver B for seven years. It is not a stainless
unit, but I get many compliments on its conditions when people hear ho
wmuch I use it and how old it is. I clean it to some degree after each
use and I keep it covered - - I am amazed that cover is still 100%
intact after sitting outdoors for as long as I have the grill...

But a couple of months I got a bit remiss about cleaning the grease
pan. Well...

"Honey!? Do we have any baking soda?"

"Yeah!"

"Could you grab it and bring it out to me... like right now?"

"WHY!?!?"

"Uh. The barbeque is on fire."

"What do mean, 'the barbeque is ON FIRE'?"

"This isn't the kind of fire you want in the barbeque.... could you
hurry it up a bit please?...."

Needless to say, I had a bigger clean up job after that incident.
Cleaning up all the baking soda - stuff got everywhere - and it's
corrosive if not cleaned up promptly.