一贫如洗

penniless

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

poor / inadequate / deficient / garrulous

as / as if / such as

to wash / to bathe / to develop (photo)