Čisticí prostředek je v koupelně.

Czech does not have articles like English the and a/an. So Čisticí prostředek je v koupelně can mean The cleaning product is in the bathroom or A cleaning product is in the bathroom, depending on context.

If Czech speakers need to be more specific, they usually do it through context, word order, or words like ten (that/the one) rather than an article system.

Čisticí prostředek is a common phrase meaning cleaning product, cleaner, or cleaning agent.

• čisticí = cleaning / for cleaning
• prostředek = means, agent, product, or substance

So this phrase refers to a product used for cleaning, not a person who cleans.

Čisticí is an adjective derived from the verb čistit (to clean). In Czech, adjectives of this type often end in -icí, -ací, or -ící.

Here, čisticí means something like cleaning or intended for cleaning.

A useful detail: in careful standard Czech, čisticí prostředek is the normal form for cleaning product. Learners may also encounter čistící, but čisticí prostředek is the standard phrase you should learn.

It is in the nominative singular, because it is the subject of the sentence.

• prostředek is a masculine inanimate noun
• čisticí agrees with it

So the sentence structure is basically:

[subject] + [verb] + [location]
Čisticí prostředek + je + v koupelně

Because after v meaning in for a location, Czech uses the locative case.

The dictionary form is:

• koupelna = bathroom

But in this sentence, after v, it changes to:

• v koupelně = in the bathroom

So:

• koupelna = nominative
• v koupelně = locative

This is a very common pattern in Czech.

Czech uses different prepositions depending on the type of location.

With rooms and enclosed spaces, Czech usually uses v = in:

• v koupelně = in the bathroom
• v kuchyni = in the kitchen
• v pokoji = in the room

Na is more often used for surfaces or for certain places by convention:

• na stole = on the table
• na zahradě = in the garden
• na poště = at the post office

So v koupelně is the normal Czech expression.

Then you would usually use do koupelny.

• v koupelně = in the bathroom → location, no movement
• do koupelny = into the bathroom → movement toward the inside

So Czech distinguishes clearly between:

• being somewhere: v koupelně
• going somewhere: do koupelny

No, Czech word order is fairly flexible.

The neutral version is:

Čisticí prostředek je v koupelně.

But you could also say:

V koupelně je čisticí prostředek.

Both are grammatical. The difference is mainly emphasis:

• Čisticí prostředek je v koupelně. → focuses more naturally on the cleaning product
• V koupelně je čisticí prostředek. → focuses more on the location or answers a question like What is in the bathroom?

So word order in Czech often helps show what is new, important, or emphasized.

Not in a normal full sentence like this.

Je is the 3rd person singular form of být (to be), and it is needed here:

• Čisticí prostředek je v koupelně. = correct
• Čisticí prostředek v koupelně. = not a normal complete sentence

Czech often drops subject pronouns like on, ona, or ono, but it does not normally drop the verb itself in this kind of sentence.

A rough pronunciation guide is:

Čisticí prostředek je v koupelně
≈ CHIS-ti-tsee PROH-strzheh-dek ye f KOH-pel-nye

A few useful points:

• č sounds like ch in church
• c sounds like ts
• í is a long vowel, like ee in see, but held longer
• ř in prostředek is a special Czech sound with no exact English equivalent
• ě after n gives a sound like ně
• v before k is often pronounced like f, so v koupelně sounds roughly like f koupelně

Also, Czech stress is usually on the first syllable of each word group, so you hear:

ČIS-ti-cí PROS-tře-dek je v KOU-pel-ně