He turned on the water and began to wash his hands.

Or perhaps you're going to wash your hands of the whole business?

But he still felt a need to wash his hands.

Finally, remember to wash your hands before and after making each test.

"I do nothing from here but run to the rest room and wash my hands."

He got up and left the room to wash his hands.

I'd keep my back to him until he came out to wash his hands.

Now he should wash his hands of everything and walk away.

"So the companies have been able to wash their hands of the matter."

The second he learned who she was, he'd wash his hands of her.