You can't prevent it. If it rust now it will rust forever. best you can do is wire brush it off and grease it down with cooking oil. It will keep rust to a minimum.
The grill are made out of steel, that's why they rust,
replace it with a stainless steel one or
at a hardware store, get some navel jelly,
it will stop the rust, then use tin foil on the grate,
The grill are made out of steel, that's why they rust,
replace it with a stainless steel one or
at a hardware store, get some navel jelly,
it will stop the rust, then use tin foil on the grate,