google caching non-existent files help!

[bubblebobble]

Hi,

posted here because I know alot of you guys here are more savvy then me regarding website problems.

Ok, friend of mine phones me up this morning in a panic asking if i can help as when googling search terms for for website a cached page comes up which doesnt exist.
What makes this worse is that it has an adult theme.

here is the url:

xxx.xxxxxx.xx.xx\?ref=Sexªhop.Com

hes pretty worried as it may affect his business.

I have full access to his ftp. I have asked for removal via google webmaster tools and also changed the robots.txt file to deny access to said file, however it dosnt exist.

Anyone shed some light on it for me please?

Is it possible someone has referred a link to his site? and it has been cached.

help much appreciated

D