To remove stains:
Take Cascade (or some other powder dishwashing stuff), and add a little water to mix it into a paste. Then apply that to your bathtub. Let sit 5-10 minutes. Rinse. The phosphates in the powder will try to dissolve the stains. I bet this works better than Tilex.
== "One's real life is so often the life that one does not lead." -- Oscar Wilde