I'm not sure what is the BEST product, but we use a few different things on ours, depending on how dirty it is, etc.

Like Cherub mentioned above, we also use the stuff that is like a white cream that you rub onto the stovetop and then wipe away (and then rinse with a clean wet cloth). The one we usually use is this:

https://www.microspot.ch/de/haushalt...E&gclsrc=aw.ds

I believe we buy ours at the large Coop, though (not online), but I've also seen them in DIY stores like OBI. We don't use that very often, though -- only when we need to clean it really well or there is stuff crusted onto the stovetop that we can't easily get off with a scraper.

I have also found these sponges (below) to work really well. They're made especially for ceramic stovetops. The larger Coop stores sell them (near the kitchen sponges), though I don't think it's the exact same brand as this one: