How to prevent food sticking on Weber Q1000 grill?

We've been using the Q for a long time now, but don't have this problem.

Like others have said - use folded paper towel held with tongs, oil up the paper towel, and then liberally wipe down the cooking grate.

Otherwise, we treat the cooking grate like any other cast iron. Scrape it well and cook off any excess. And occasionally retreat the grate with oil and heat it up to keep it seasoned well.

Tom