A backsplash is always going to get dirty. There is no way around that. You'll have to occasionally clean it. And unless it is a really forgiving non-porous surface (glass, stainless steel, some types of well-sealed granite), it'll take some work. Any type of grout is going to be painful to clean no matter what. They make less-porous grout (e.g. epoxy based grout, and polyurethane grout), but even those aren't necessarily a panacea.

You could try something like Viper Venom Grout Cleaner. It'll cut through the dirt quite effectively. But it's some pretty aggressive chemical. Make sure you use appropriate personal protective equipment. And absolutely make sure you test it on another tile before. It definitely has the potential of damaging tile or some natural stones.

When you are done, seal the surface. But don't expect miracles. Sealing isn't going to prevent discoloration. It'll simply make it easier to clean in the future, as it seals the pores and makes it less likely for grime to get into the tile/stone.

Or you could live with the discoloration and consider it a side-effect of picking a natural stone in your kitchen.

As M stated, not all materials are suited to be used behind a range. Some ways to lessen the effect is to start your hood early on a medium or high as soon as you turn on the oven or before you start cooking on the range top. This gives time for the airflows around the range naturalize and to be pulled up and away from the rear backsplash.

I noticed you have what is normally called an Island style trim for your rear vent area. Island trims are made to let the oven heat to travel straight up to the hood whereas a raised type rear is designed to push heat and smoke away from the rear wall. Usually manufacturers make 2 or 3 different rear vents and you choose for the application you are using it in.

If your staying with an island style rear trim starting the hood early will help.

A mild abrasive like Bar Keepers Friend will remove the stains from the Stainless and the tile.

Whatever you do I would do a test a small area before you go all in. Natural stone can be easily damaged by abrasive cleaners.

Hi All,

Thank you for sharing. I appreciate the helpful advice and will definitely try it.

Best

I have the same issue! My backsplash is a porcelain tile, any advice as to how to remove the staining? I’ve tried Barkeepers and Dawn dish soap.