How do I get stains/limescale off my bathtub? Nothing seems to work.

Hello…

I have an old porcelain bathtub and it seems to have a stain that follows the path of the water as it drains. It extends from the drain to the back of the tub in a path that is about 4–7 inches in places. I seem to have tried everything…but the outline of this is still on there and then fills in yet again.

I’ve tried mold spray, bleach, Ajax, Scrubbing Bubbles, and another product from Germany. I’ve used brushes and sponges. Nothing. I’m in the UK, so we don’t have a lot of American brands. I used to use a product that had a letter and a number on it back home (Z-12) or something like that, but they don’t have it here. I’ve also tried most limescale stuff, too.

It just looks like it isn’t clean and it just bothers me. Also, there are limescale stains down the tub where the faucets are and those are impossible to get clean, too.

Does anyone have something that worked for them? Send any info on the chance that I have not tried it.

Thank you so much!