Не стоит оставлять мокрую губку в раковине.

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Breakdown of Не стоит оставлять мокрую губку в раковине.

• не: not
• раковина: the sink
• оставлять: to leave

Questions & Answers about Не стоит оставлять мокрую губку в раковине.

Why does не стоит mean something like you shouldn’t / it’s not a good idea, even though стоить usually means to cost?

In this sentence стоить is used in an impersonal modal pattern: (не) стоит + infinitive = (it’s not) worth (doing) / (you) shouldn’t / it’s not advisable.
So Не стоит оставлять... literally is It’s not worth leaving..., but in natural English it often comes out as Don’t leave... / You shouldn’t leave....

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Who is the subject here? Why is there no word for you?

There is no grammatical subject; this is an impersonal construction. Russian often gives advice without naming the person:

• Не стоит оставлять... = One shouldn’t / You shouldn’t / It’s not a good idea to...
  If you really want to specify, you can add a person, but it’s less common:
• Тебе не стоит оставлять... = You (specifically) shouldn’t leave...

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Why is it оставлять (imperfective) and not оставить (perfective)?