Не стоит оставлять моющее средство на краю стола.

It’s not worth leaving the cleaning product on the edge of the table.

Breakdown of Не стоит оставлять моющее средство на краю стола.

• стол: the table
• на: on
• не: not
• оставлять: to leave
• стоить: to be worth
• край: the edge
• моющее средство: the cleaning product

Questions & Answers about Не стоит оставлять моющее средство на краю стола.

What does не стоит + infinitive mean grammatically? Who is the “subject”?

Не стоит is an impersonal construction: literally (it) isn’t worth (doing) / it’s not a good idea (to do). There’s no explicit subject; the idea is general advice to anyone.
Pattern: (не) стоит + infinitive → Не стоит делать X. = You shouldn’t / It’s not worth doing X.

Why is стоит used here—doesn’t it mean to cost or to stand?

Yes, стоить can mean to cost, and стоять means to stand, but (не) стоит + infinitive is a fixed, very common idiom meaning (not) worth / (not) advisable.
So Не стоит оставлять… isn’t about price or standing; it’s advice: Don’t leave…

How is не стоит different from не надо or нельзя?

They differ in strength and tone:

• Не стоит… = mild advice: it’s not a good idea, better not
• Не надо… = more direct instruction: don’t (do it)
• Нельзя… = prohibition: you must not / it’s forbidden
  So не стоит sounds a bit softer and more “practical.”

Why is the verb оставлять (imperfective) and not оставить (perfective)?

Оставлять (imperfective) fits general recommendations and repeated/typical situations: It’s not a good idea to leave it (in general).
Оставить (perfective) would sound more like a single, specific instance: Don’t leave it (this time / once). Both can work, but не стоит + imperfective is especially common for general advice.

What case is моющее средство in, and why does it look like the dictionary form?

It’s the direct object of оставлять, so it’s in the accusative.
But средство is neuter inanimate, and for neuter inanimate nouns the accusative = nominative, so моющее средство looks unchanged.

What exactly does моющее mean here? Is it an adjective or a verb form?

Моющее is a form historically related to a participle (from мыть = to wash), but in modern usage here it functions like an adjective meaning washing/cleaning.
So моющее средство literally = cleaning agent, i.e. detergent/cleaner.

How would you say “a detergent” or “some detergent” here—can Russian omit articles?

Russian has no articles, so моющее средство can mean a cleaning product / the cleaning product, depending on context.
If you want to emphasize “some,” you can add words like:

• немного моющего средства = a little detergent
• какое-то моющее средство = some (unspecified) detergent

Why is it на краю стола and not на край стола?

• на краю (prepositional) answers where? → on the edge
• на край (accusative) answers to where? (movement onto the edge)
  Here it’s about location (leaving it sitting there), so на краю is correct.

What case is краю, and why is it -ю instead of -е?

краю is prepositional singular of край after на (meaning location).
Many masculine nouns have a prepositional form in -у/-ю in certain set expressions, especially for “locations/points”: на краю, в лесу, в саду, etc. (You may also see на крае, but на краю is the common fixed phrasing for “on the edge.”)

Why is стола in the genitive?

Because край (edge) is a noun that commonly takes a complement in the genitive: край чего? = the edge of what?
So на краю стола = on the edge of the table.

Is the word order flexible here? Could I say Не стоит на краю стола оставлять моющее средство?

Russian word order is relatively flexible, but it affects emphasis and naturalness. The given sentence is neutral and very natural.
You can rearrange, but Не стоит оставлять… is a common, smooth start for advice. Putting на краю стола earlier emphasizes the location, but some rearrangements can sound heavy or awkward in everyday speech.

How do you pronounce моющее and what’s the stress?

мо́ющее has stress on the first syllable: МО-ю-ще-е (with ё giving a yo sound).
Many learners find the vowel sequence tricky; it’s essentially мо + ю + щ + е + е in careful pronunciation.