How to cleaning plastic shower.

The problem is : I have an old farm house that has been sitting a few years and has a plastic shower stall. It is in good condition except for brown stains that seem embedded. I’ve tried the basic 409, Comet Spray, and the Mr. Clean pads, but nothing works well. Will anything get it white and clean again?
 

The solution is

1. not sure if you’re still having this issue but I was thinking … I wonder if you coated the bottom of it with a paste of baking soda and water, and then sprayed it with vinegar – the vinegar would cause the baking soda to foam up, if you let that sit a while maybe it would loosen up the embedded dirt and grime to allow you to get it clean? Just a thought!

2. yes it is nice advice you have given…along with vinegar you can also use it with petrol…

3. Hello you can try this. It may help you..Clean mineral deposits from a shower head by removing the head, taking it apart, and soaking it in vinegar. Then brush deposits loose with an old toothbrush. Clean the holes by poking them with a wire, pin, toothpick, or ice pick.