Originally Posted by
Time Zone
couple milder approaches than the Bar Keeper's Friend I mentioned above:
Bon Ami - powdered cleanser - IIRC claims to be "no scratch"
Comet - powdered cleanser, claims to be "no scratch" these days, but it does have bleach.
Sometimes these will get out the same things I might turn to BKF for, but they often require a bit more elbow grease. I'd start with Bon Ami and see how you do.
Note, Bar Keeper's Friend is probably not a good choice for anodized aluminum; there's a cautionary note on its label regarding this. I didn't see anything about its applicability to titanium on the label.