A good basic cleaner is baking soda made into a paste. Scrub the stain with the paste then rinse. Spraying with vinegar before rinsing can help lift extra dirt from the surface. Do not use ammonia, it can damage the finish. [I found this out when I mixed ammonia and soap to remove a copper stain on a tub]
To remove a rust stain from a porcelain sink, cut a lemon in half. Pour some salt onto one of the cut halves and use it to scrub the stain.
With a tub strainer dumbell wrench.
Easy Off, Bam!, and Mr. Clean Magic Eraser have been recommended for removing metal marks from porcelain tubs.
Yes, the whirpool duet tubs are made of porcelain.
Porcelain is a type of ceramic; it is not part of a steel tub. If the tub were made of porcelain it would not be made of steel. Enamel is a kind of tough paint that can be used on steel, or on porcelain.
softscrub
Bleach might remove dye stain from a fiberglass tub if it is caught early enough. The areas of dye stain can be soaked with bleach over time. This might take a while.
Possibly, if you really cleaned the tub aggressively with lacquer thinner or similar de-greaser.
I use baking soda to clean my acrylic tub/shower. It gets out a multitude of stains. Maybe it will work on this
15-16 inches from back wall. 8-10 inches from side wall tub drain is on. Measurements are to center of tub drain hole. Measurements are close, not exact, and are for a standard tub.
scrape it with a razor blade...assuming the tile is untextured porcelain
Most of them are in the wall. The other would be a deck mount, which is mounted to the fiberglass tub deck and uses a Roman Tub Faucet.
here is no way to actually remove it other than light sanding then finish off with a clear coat hard paint. Krylon spray is best.