2, commonly used stainless steel contain iron components.
3, you buy stainless steel should belong to the stainless steel in the material of the most inferior 200 stainless steel.
4, the way to prevent rust is basically by prevention, try not to touch the water.
5, it is recommended that you buy a piece of "brushed cloth", sell hardware and tools, and then wipe your windows, it should be much better.