My carboys always get a "to the brim" overnight soak in Oxy after their most recent tour of duty. Way easier than letting them sit in the open air until all the yeast and krausen residue dries to the bottom and sides until your forget about it 30 minutes before you have to rack to primary and realize you have to friggin SCRUB it to get it clean now.... of course, I'm sure I'm the only one who's ever done that.
I live in an apartment, I have no yard nor outdoor realm at all, so no I brew in my kitchen. When its time to cold crash I open a window and turn my basement into a refrigerator.