is it possible to nofollow an iframe?
 

i realise you can't nofollow the actual iframe code you enter into a webpage but is there a way of doing this in some other way?

anyone got any ideas?

use javascript to print the iframe perhaps?

or robots.txt

i don't know for sure but if you blocked /iframe/ in robots.txt then in /iframe/ you just did a 301 redirect then it would probably not get followed by search engines/bots