As an ordinary person, I certainly feel it is my duty to leave things as I find them. I have on occasions spilt some tea or milk etc. and it takes very little effort to wipe it up and (assuming a reusable clock or sponge) rinse it out. Yes, placing items in a dishwasher is a simple task (if only my family would learn). I would have no problem emptying a dishwasher although I do have to be careful that on a clients' site that they don't feel that I am not utilising my time employing my expertise as they expect. I tend to guage it, place by place.
I do get infuriated by those small minorities who do nothing.
I was once on a team where each of use would take turns getting a round of drinks in (zero cost i.e. free tea, coffee, water etc.). Some would get it more often than others but this tended to be a natural balance as those of us who got it more where the ones who drank more. There was one exception. One chap thought that it was beneath him to get drinks. After a couple of months of trying to cajole him into just getting one round in I realised that it was winding me up. So I stopped asking if he wanted one. When asked I explained to him that I felt it was unfair, it was winding me up and if he wasn't prepared to occasionally get a round in then I wouldn't get him one so that it no longer bothered me. He called me "petty". I didn't care.
-- Stop your grinnin' and drop your linen...they're everywhere!!!