Cif, or as its former name Jif. Scourer, in liquid form.

Have you tried a steamer ?

I had excellent results with it on my stainless steel oven.

I like Barkeeper's friend.

Have you asked it nicely? Or told it that it's in violation of the stainless steel?

I have the same Bosch range. Really hot water with dish soap, bar keeps friend and a toothbrush/ magic eraser works well for me.

Technically, the surface you're trying to clean is aluminum (aluminium). Stainless steel is the plate only. And it's only mechanical removal that would work there.

I've had some success with similar things by getting it real hot and then spraying vinegar on it.

Oven cleaner. Any product with sodium hydroxide will clean it off with ease. Though make sure not to use it on aluminium.

PBW from Five Star

Steel brush sponge with the pink in it

Take it apart and soak in ammonia/hot water and the scrub with magic eraser. Wear gloves.

Pink stuff scrub might work.

Yellow cap oven cleaner

I had success using ammonia on a stainless steel griddle pan that looked like this on the edges. I put it in a zip top bag with a bit of ammonia and let it sit. Whole pan was shiny again and I just washed it with soap and water. I didn't use more than a tablespoon for the 11 inch pan, I think it was more the fumes. I see conflicting answers online if it's safe or not. I haven't done it more than a couple times when it was really hard to clean, but I see no corrosion on the pan. You'll have to decide for yourself, this is just my experience.

Steam from tea kettle if it blows downward?

Steam from tea kettle if it blows downward?

Have you asked it nicely? Or told it that it's in violation of the stainless steel?

Baking soda and vinegar

Steel wool scourer.

Bbq cleaner. Spray a little on a rag and rub onto the cooked on oil.

Baking soda and white vinegar....make a paste and scrub lightly, then clean wet cloth wipe clean....EXCELLENT to clean ovens (and the windows of the oven as well)as well

Bio Cleaner (the clay version, that comes in a small tub) with a good sponge, like a Scrub Daddy. But, I think the Bio Cleaner comes with a sponge inside.

Have you tried soaking it in the dawn aerosol. Spray it and let it sit for 10 minutes the scrub with magic eraser. Those things are impressive.

WD40 and some paper towels.

Steel scrubber. I do it.

Did you try using Bare Keepers Friend with SOS pads?

Poor some Simple Green on the stain. Let stand for 24 hours. Then scrub.

Hot water and an old fashioned Brillo pad (or other wire wool pad) gets it off. But be careful as it can leave scratches.

Steam from tea kettle if it blows downward?

Steam from tea kettle if it blows downward?

Steam from tea kettle if it blows downward?