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Use "washdays" in a sentence
"Libraries were omnipresent, like tap water, washdays on Monday and park attendants who shouted at children."
"On most washdays I use chlorine bleach on several articles whose labels proscribe it, without the slightest damage, and many of these have been receiving chlorine bleach now and then for years."
"But she was staying for weeks, after all, and given the weather, couldn't count on regular washdays."