Remojo la ropa hasta que salga la mancha.

In Spanish, ropa is a singular collective noun. It refers to clothing in general, even though English usually uses the plural clothes.

So:

• la ropa = the clothes / the clothing
• la ropa está mojada = the clothes are wet

You do not normally say las ropas for ordinary clothes. That plural exists, but it usually sounds more specialized or means different kinds of garments.

Remojo is the first-person singular present tense of remojar:

• yo remojo = I soak / I am soaking

So the sentence starts with:

• Remojo la ropa = I soak the clothes / I’m soaking the clothes

Spanish often uses the simple present where English might use either:

• I soak the clothes
• I’m soaking the clothes

depending on context.

Spanish often leaves out subject pronouns because the verb ending already tells you who the subject is.

• remojo clearly means I soak
• so yo is optional

You could say:

• Yo remojo la ropa...

but it is not necessary unless you want emphasis, contrast, or clarity.

For example:

• Yo remojo la ropa y tú lavas los platos.
  = I soak the clothes and you wash the dishes.

Because after hasta que, Spanish often uses the subjunctive when the action has not happened yet and is being viewed as a future or expected result.

Here, the stain has not come out yet; that is the goal. So Spanish says:

• hasta que salga la mancha

not:

• hasta que sale la mancha

A useful rule:

• hasta que + subjunctive = until something happens in the future / is still pending
• hasta que + indicative = until something happened / happens as a known fact

Compare:

• Remojo la ropa hasta que salga la mancha.
  The stain hasn’t come out yet.
• La remojé hasta que salió la mancha.
  I soaked it until the stain came out.

Salga is the present subjunctive form of salir for él/ella/usted.

Conjugation:

• yo salga
• tú salgas
• él/ella/usted salga
• nosotros salgamos
• ellos/ustedes salgan

In this sentence, the subject of salga is la mancha, which is singular, so:

• la mancha salga

Even though mancha is feminine, that does not change the verb form. Verb agreement is about number and person, not grammatical gender.

In Spanish, salir can be used for stains, dirt, spots, and similar things to mean come out, wash out, or be removed.

So:

• salir la mancha = the stain comes out
• No sale la mancha. = The stain won’t come out.

This is a very natural use in Spanish. English often uses a different verb, but Spanish commonly uses salir in this context.

La mancha usually refers to a specific stain already understood from the situation.

So the sentence implies:

• there is a particular stain on the clothes
• the speaker is trying to remove that stain

If you said una mancha, it would sound less specific, as if you were talking about any stain rather than the one you already have in mind.

Yes, it is understandable and grammatically correct. It means something like:

• I soak the clothes until the stain comes out.

That said, depending on the context, native speakers might also say things like:

• Dejo la ropa en remojo hasta que salga la mancha.
• Pongo la ropa en remojo hasta que salga la mancha.
• Remojo la prenda hasta que salga la mancha.

These can sound a bit more natural because remojar often implies putting something to soak, and with clothing people often talk about leaving it soaking.

They are related, but not exactly the same.

• Remojo la ropa = I soak the clothes
• Dejo la ropa en remojo = I leave the clothes soaking / I leave the clothes to soak

The second version emphasizes that the clothes stay in water for some time. In everyday laundry contexts, dejar en remojo is very common.

So if you are talking about treating a stain, many speakers might naturally say:

• Dejo la ropa en remojo hasta que salga la mancha.

Yes. The Spanish present tense can cover both ideas, depending on context.

It can mean:

• I soak the clothes until the stain comes out.
  (habitual / what I usually do)
• I’m soaking the clothes until the stain comes out.
  (right now)

If you want to make the ongoing action more explicit, Spanish could also use:

• Estoy remojando la ropa hasta que salga la mancha.

But the simple present is still perfectly possible.

No. It depends on whether the action is viewed as pending/anticipated or as a completed/real fact.

Use subjunctive when the action has not happened yet:

• Espera aquí hasta que llegue Ana.
• Remojo la ropa hasta que salga la mancha.

Use indicative when you are talking about something that did happen:

• Esperé aquí hasta que llegó Ana.
• Remojé la ropa hasta que salió la mancha.

So hasta que does not automatically force the subjunctive; the time/reference matters.

Yes. That is also very natural.

Compare:

• hasta que salga la mancha
• hasta que se quite la mancha

Both mean that the stain is removed. In everyday speech, many speakers may prefer quitarse or similar expressions in some contexts:

• No se quita la mancha.
• La mancha no sale.

So both patterns are common:

• la mancha sale
• la mancha se quita

Because Spanish does not need to state that if it is obvious from context.

Remojar already means to soak, so the liquid can be left unstated. If needed, you can add it:

• Remojo la ropa en agua.
• Remojo la ropa en agua con jabón.
• Dejo la ropa en remojo con detergente.

Without that extra information, the sentence just focuses on the action and the result: soaking the clothes until the stain comes out.