get your hands dirty不是把手弄脏的意思，而是亲力亲为、身体力行。

【例句】
Get your hands dirty and be prepared to physically walk the talk.
身体力行带头参与到工作当中。

As long as you're willing to get your hands dirty, she'll be happy, and relieved that she didn't have to do it herself!
只要你愿意动手打扫，她就会很开心，她会因为自己不必亲力亲为去打扫而减轻了负担！