Those grease stains won't wash off.

那些油渍洗不掉。

《牛津词典》

"You're wrong about the crumbs," said the Mock Turtle, "crumbs would all wash off in the sea."

“面包屑你可说错了，”假海龟说，“海水会把面包屑冲掉的。”

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Wash off fruits and vegetables with cool running water.

“洗刷水果和蔬菜要用冷的自来水”。

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It will also examine how residues pass through the human body or wash off.

BBC: University studies drug residue pollution in water

They waddle down to the water to wash off the rust-colored guano that stains their pelts and produces a pungent odor that within days becomes expected with each landing.

FORBES: Go with the Floe

But mud, once thrown, is hard to wash off.

FORBES: Magazine Article