Over the summer I taught my daughter and a friend to use my stainless flat filtering canner bottler, and should have watched closer, as they burned the bottom over propane flame. Not their fault, i should have explained how to watch for that. It's a 12"x12" stainless pan. Anyway, I thought soaking in a hot vinegar-water mix for a day to few days would be enough to remove the burn, but there's still a patch around 3" x 5" I can't get out. I used the vinegar water, let soak 1-3 days, then scrubbed with a soft sponge and got some of it, and then a teflon spatula to get more of it. My wife suggested soaking in vegy oil which she's used for kitchen pans. Again it helped a little. But i've got this remaining 3"x5" patch (see photo) and wondering if:

1. other methods to safely remove the rest of the black without scratching the stainless surface
2. if i leave it as is, will it affect my syrup - taste or otherwise? I re-bottled some with this burn in it, and thought it didn't taste quite as good, or quite as "clean" maple. But i'm not sure.

Tom
Filter pan burn.jpg