Best way to get porcelain stovetop clean? (cleaning, glass, outside)

[Sabinerose]

Just like it says... what is the best way to get my older stovetop (flat glass / porcelain kind) clean? It had some boilover burned on around the outside of the burner areas... I got that off, but I am left with brown rings. Any way of removing those? I have tried a few things, but I am not sure what will damage the glasstop.

[K'ledgeBldr]

The subject has been covered before- use the "search this forum" box at the top of the page.
Also check the "cleaning tips" sticky at the top of the page.