Neither of our cats respond to catnip. In fact, both seem to regard it
as noxious.  Tonight I discovered, quite by chance, Spock's drug of
choice - bleach.  We don't use much bleach because we have a septic
waste treatment and large quantities of bleach kills the septic and
makes it smell much worse than usual (eeeeuuuuu!).  

Tonight, though, I had to use dilute bleach to clean some benchtops
prior to re-organising half the house and, when I had finished, Spock
was *all* over my hands - rubbing, purring, nibbling and generally
acting like a total niphead.  Of course, Spocky was also all over the
benches I was trying to clean, but that was more fun than annoying (I
don't mind kitty foot prints on my benches, unless they're food
preparation benches).  

So, now I know.  If I want to give my grey boycat a big thrill, I
simply need to do some housework!

Tish

PS. the outcome of the inaugural Fancy Feast experiment was
overwhelmingly positive.  Both cats *loved* it and turned up their
spoilt little noses the next day when I tried to impose their normal
food on them.  Lucky for me, they had forgotten by the day after and
are back to their normal diet. Phew - I couldn't afford FF at the rate
they eat it!