Going to the toilet

Now i got into this discussion with a mate of mine about cleanliness in general and cleaning up in the toilet specifically. (I dont know how it happened :) )
well basically we were talking about the pros and cons of cleaning with a tissue as compared to cleaning with water....
the convo went something like this (with poetic licience):

Me: what i dont understand is why people wash their hands after going to the toilet?
Mate: Man, its obvious! its so they are clean! are you tellin' me you dont wash your hands after going to the toilet?!
Me: No (i do just for the record :)), What im saying is...why do people clean the dirtiest part of their body superficially using a tissue, but then take the right steps to wash their hands with water...surely they should either not wash them at all as they are less dirty or wipe them with a dry tissue?
Mate: err...because its a part of the body we can see...or use more...
Me: Okay lets give You an analogy: You get some dog-poop and smear it all over your armpit, as that is a part of the body little seen and little used, would you, using your philosophy of "clean it if you can see it" clean it still?
Mate: yeh i would, but anyway we have a shower everyday..!
Me: So you're admitting the superiority of cleaning with water?
Mate: ...
Me: And anyway, you go around for the rest of the day with poo sticking to your body...even a baby is in a better state man! he gets cleaned with wet wipes!
Mate: oh look lets go into our class....
Me: yeh lets, and by the way, we clean ourselves with water as thats what our religion teaches.
Mate: yeh it does seem kinda right....maybe we should all start cleaning ourselves with water.

Yeh, that wasnt at all how the convo went, but some key points of discussion that were raised, i tried to mention.

Anyway ill leave you with this rather elegant (im new to them) equation relating to imaginary numbers:
(a+bi)(c+di) = (ac-bd)+(bc+ad)i

where i is the square root of -1 and i squared is -1