If your tile is ceramic or porcelain, then use Bar Keeper's Friend mixed with a touch of water and those metal marks will come off in a blink of an eye. BKF has oxalic acid, so it's not necessarily something you wanna use on stone.
Get the powdered variety at your local grocery store or hardware store for less than 2 bucks a can. Do NOT get the liquid stuff......not the same formula and doesn't work the same.
Tonto Goldstein….. but my friends call me Bubba
"The best way to get a bad law repealed is to enforce it strictly"
- Guy on the five