I am referring to those non-slip marks on the bottom of the tub. They always look dirty to me. Anyone here know how to get them clean. ( I know they are clean but just don't look like it) Would feel better if they looked clean.

Vinegar water - if you can let it soak for a while, the better. My DH's shower is brigh white because he uses the solution for something else, and dumps it into the shower after using.

If vinegar water doesn't work, try scrubbing with the Mr. Clean white sponges (I forget what they are called)... magic erasers?

U just go inside to clean it and (not from out side) use "jif" or the older product which is powder "Vim" but which is old, always new, green product is Bicarbonate Soda mixing with what ?or use alone I am not sure.
And use not very hard sponge to avoide scratching.

Tilex spray...I swear by it...

I would try the vinegar solution...it usually works on anything.

The thing that kills me about this particular problem is that when you get it all clean if you step into it (the shower)with dirty feet it's immediately stained again. Anyone have any ideas about what to use to keep that from happening? I mean so that you don't have to scrub footprints out of the shower every time you use it. It's so annoying.

I know what you mean - I have scrubbed them with a hard bristle brush, all kinds of cleaning stuff, NOTHING.

It is easier to remove them than to get them clean. Maybe that's what the manufacturers were thinking...

Vinegar works for me.

Goo-Gone!! It takes all the sticky from anything! Been around for ever! Available Everywhere!