Sprinkle baking soda or cream of tartar on the surface then pour on some vinegar. Use a paper towel or two, a little more baking soda if needed to scrub spots, and you have a clean cooktop faster than any of those commercial cleaners. It's non toxic and cheap, too. If you have a baked on spot on the top or in any pan that has been sitting dirty too long, just put some water and a denture cleaning tablet on it. Takes it right off with no effort.
For the fastest cleanup, I keep a pump spray bottle of 50% water and 50% rubbing alcohol in the kitchen. Spray that on the stove top and clean up very quickly. The vinegar and soda is needed only for bad messes. The alcohol and water cleans up grease and stuff very quickly.