[By cats! It does sound like a must-try option, doesn't it? And, after all, most would say that the greatest battles one can fight are those against oneself~!
... Well, perhaps fighting a visceral feeling of repulsion isn't quite what people mean by that... but Dazai wouldn't know. He'd rather not do the fight thing in general.

"Childe" is normally followed by an actual name, in Dazai's admittedly largely theoretical experience, but if that's what the (former?) stranger is going with, then Dazai will play along. If he wants the truth, he might be able to find out, but he doesn't currently care enough, and saying otherwise out loud can only damage his case regardless. So "Childe, just Childe" it is!]

It would be hard to wash them otherwise, wouldn't it?

[So of course he took off his clothes! Logic, he has it. Multitasking, Dazai flicks through the magazine in the meantime, sometimes finishing a page in one second flat, sometimes taking longer and... apparently reading it bottom to top after finishing it top to bottom? Who knows what mind games he's playing with himself for entertainment, really.]

I did consider getting into the machine with my clothes on, but I already took a shower yesterday.

[That is not how washing machines work... but then, Dazai would have found a way. Just put a machine on its side, open the lid to make it a tiny one-person circular bath tub... Add some soap...... It would be so much fun to be spun around like that while bubbles slowly consume the entire laundromat.]