How can I remove stains on a shower container? I have stains on my shower floor pan. It's made of plastic....

I have stains on my shower floor pan. It's made of plastic. There are stains from where on earth I stand and water stains. I've tried a lot of the commercial cleaners - but none give the impression of being to remove all the stains and restore it to it's original white.
Answers:    The fundamental thing I swear by is the Mr. Clean Magic Erasers. Anytime I have given up on cleaners I tried the eraser and I own always been contented. I use it on my walls, my tubs, my sinks. (which some are even dull porceline so dirt clings to that everytime)
scrubbing bubbles . buy this stuff at the dollar store
spray cans... spray. agree to sit for 3 mins
then re apply work great wash rotten