Tā de zhàngmù yīqīng'èrbái, shéi yě tiāo bu chū máobìng.
His accounts are spotlessly clean. No one can find a thing wrong with them.
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Used by 茅盾 (Mao Dun) in 《劫后拾遗》 and 周立波 in 《暴风骤雨》, where characters insist their conduct is 一清二白, entirely above suspicion. Modern usage carries the same defensive flavor: declaring innocence rather than describing it neutrally.
memory
Picture two clean elements: 一清 (one clear) + 二白 (two white). 'One pure, two spotless', doubly innocent.
