pure common sense

Both have common sense on their side, the dirty guy needs cleaning but then again maybe he's dirty because he wants to be and the clean guy is obsessed with being clean.

Hmmm - The clean guy can only see someone dirty, so he thinks that he is dirty too. The dirty guy can only see someone who is clean, so he thinks that he is clean too? So the clean guy has a shower.

craven de mere is right. Both do have logic on their side, which means that it's impossible to determine the one who is going to take the shower. It was a cruddy riddle but still, like i said, you use common sense. and k8, you made a mountain out of a mole hill with the riddle, but good theory though.

K8 had the original answer, I've read it before

but still, it never said anything in the riddle about anything having to do with seeing dirty ppl

The original question went something like:

Two brothers were working in a garden. After a few hours, one of them was extremely dirty, and the other was extremely clean (slacker). Who took a shower and why?

The clean one. While one was working in the garden, the slacker one slipped away and took a shower.

The fault is mine...you need a different reasoning, and possibly a different answer. Let me now say that he slacked off during the work, but did not sneak away to take a shower. Now what is the answer?

Craven and K8's answers both require you to assume a specific instance in the problem. The clean one isn't just clean, but is obsessively clean, and the problem dosen't state either of them seeing the other. I think it would just be, the dirty one, becuase the clean one dosen't need a shower. Simplicity in it's purest form.

This seems to get more complicated every post...