Hi: Jon Vermilye... I second the Bar Keepers Friend... but use it with plenty of water. Our next neighbour at Niagara Wine Escape
last year had a fly past dropping after the "Goose" had visited the vinyard. The "Colour Purple" is nice but just not down the front of a 5.0. Bar Keepers Friend and copious amts. of water did the trick where others failed.
Label says Cleanser & Polish for S/S, Fiberglass, Porcelain, Glass Cooktops, Copper, Tile, Brass. http://www.barkeepersfriend.com
Read the surface guide.
Available where most cleaning supplies are sold. I don't work for them but it works for ME!!!
Alf S. North shore of Lake Erie