https://www.novelupdates.com/series/i-just-wanted-to-white-wash/

Description [Edit]

Su Yan, as a really good citizen, was unfathomably chosen by a system suddenly one day.

Su Yan: Why me???

Sir System: Because you are a good woman.

SuYan: #%*...

From then on, Su Yan traversed various worlds, white-washing all sorts of bad women. But...why is it that she was always eaten cleanly by lord male lead? What happened to aloof and self-restrained? What happened to staying away from sensuality? What happened to hating me? I just wanted to white-wash only!

The female lead ceaselessly transmigrates, white-washing all sorts of bad women, but always getting pushed down by the male lead...(novel is slightly Mary Sue, the plot serves the smut)