Do you mean under the grids? If so then all you do is use your green scrubby pad to rub it off. All of the stainless will"stain" at times. I just do a quick once over with the scrubby if it needs it. So far it has only been a couple tiny areas. Let me know if this works. I think others use Bar Keepers Friend to clean but I have not needed it. c

Yes, the area under the grids, around the burner. I'll try your suggestion and see what happens. Thanks, Trailrunner!

We have ordered a Caldera gas cooktop to install next month. Do you like it? What are you using for a vent?
I'm a bit confused about downdrafts and how to select one.
Thanks!

Debra I don't have a down draft and am not sure about how one does them with a gas cooktop. You might want to do a search for this topic and then post a query. I have a 54" /1400 cfm Tradewind liner in a custom wood hood over a 36" Caldera gas cooktop and a Miele built in deep fat fryer. We have a remote blower roof mounted and an inline silencer.. It is all very quiet and efficient. I love my Caldera and because of my posts a lot of folks bought them and all have said they love their cooktops without any reservations.

Please ask any questions and if I can I will be glad to help. c

Always clean or scrub with the grain of the brushed stainless steel cooktop surface. As with wood, scrubbing against the grain can create scratches.

https://www.minisplitheat.com/

Wipe spills and stains up immediately or as soon as you notice them -- the less time the offending spill is on the surface, the less chance it has to set.

Clean the cooktop frequently, or at very least wipe it down with a damp paper towel often. This will avoid grease and dust buildup that, over time, makes cleaning a more difficult task.

Salt also removes stains from stainless steel. Test it first in an inconspicuous area by placing some salt on a damp soft cloth and rubbing with the grain of the steel. Some stainless surfaces are more prone to scratches than others.