I have a shower in my apartment with a pretty dirty base. I'd love to give it a real good cleaning, I haven't tried much yet, but I think the best strategy would be to determine the material of the base and then learn about cleaning that material.

Here are some photos of the base:http://imgur.com/a/9jYIF

 * What can I do to determine the material?
 * Does it even matter, is there some kind of cleaning solution I can use no matter that material?