For texturing of mirror (what we see in the toilet :} )through Vray. I choose these settings. Anyone can tell me changing any setting will give more realistic look.
Link of image
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http://threedy.com/site/forum/attachment.php?s=&postid=200688
Less reflection and a dirt map should do the job
where to add a dirt map can you show some example with the help of images or send any source file on ashras99@fastmail.fm
You can put it in the diffuse channel with an alpha and start playing with the diffuse value.Sorry i don’t have time to make an example for you but with a little experimentetion you can get a nice result.Hope i helped a bit.
A perfect mirror would have a black diffuse I believe because it absorbs no light. Problem is all the light you get off a mirror is reflective caustics, that could take a while.
hmm if you want a nice mirror like in a bathroom, then you dont want a dirtmap. and you do want full reflection.
I would say for a clean highly reflective mirror your settings are fine.
If you wanted a crack mirror in a rundown old mansion (for example) then you would want to lower the relection abit and dirty it up. But apart from that what u got is fine.
But like i said, it all depends on the type of mirror you want and where its placed.
rhino:
Correct me if im wrong, but once you have a fully reflective material doesnt the diffuse color become irrelevant? Obviously once it drops below fully reflective then it starts playing a part.
Daforce thanks very much for your detailed answer.
Infact I am trying to create a clean mirror in bathroom. That’s it.
Thats ok.
Well thats good, then your settings are fine…if not perfect 
Post a render of your scene so we can help your scene look more realistic.