Vou deixar a camisa de molho porque a mancha não saiu.

In Brazilian Portuguese, ir + infinitive is a very common way to talk about the near future.

• vou = I go / I am going
• deixar = to leave / to let

So vou deixar literally means I’m going to leave, and in natural English it can be translated as I’ll leave or I’m going to leave.

This structure is often more common in everyday speech than the simple future form:

• Vou deixar a camisa de molho. = I’m going to leave the shirt soaking.
• Deixarei a camisa de molho. = I will leave the shirt soaking.

The second version is correct, but it sounds more formal or literary in many contexts.

Here, deixar means to leave something in a certain state or place for some time.

So:

• deixar a camisa de molho = to leave the shirt soaking

It is not leave in the sense of go away from a place. It means leave something as it is / let it stay that way.

Other examples:

• Vou deixar a porta aberta. = I’m going to leave the door open.
• Ela deixou o arroz no fogo. = She left the rice on the stove.

Yes. De molho is a very common expression meaning soaking or left to soak in water or some liquid.

So:

• a camisa de molho = the shirt soaking / left to soak

This expression is used with clothes, beans, dishes, and other things that stay in liquid for a while.

Examples:

• Deixei o feijão de molho. = I left the beans soaking.
• As roupas estão de molho. = The clothes are soaking.

You should learn de molho as a chunk, because translating word by word will not help much.

Portuguese uses definite articles much more often than English does.

So even when English says:

• the shirt
• the stain

Portuguese also uses the article naturally:

• a camisa
• a mancha

In many cases where English might say my shirt or just shirt, Portuguese may still prefer an article if the context is clear.

For example:

• Vou lavar a camisa. = I’m going to wash the shirt / my shirt.
• O carro quebrou. = The car broke down.

Using articles this way is very normal in Portuguese.

Here porque means because, so it is written as one word.

• porque = because

In your sentence:

• ...porque a mancha não saiu. = ...because the stain didn’t come out.

This is different from:

• por que = why / for what reason
• por quê = why at the end of a question
• porquê = reason as a noun

Examples:

• Por que você saiu? = Why did you leave?
• Você saiu por quê? = You left why?
• Não sei o porquê. = I don’t know the reason.
• Saí porque estava cansado. = I left because I was tired.

That is a very common learner question. Sair does literally mean to leave, to go out, or to come out, but in Portuguese it is also commonly used for stains, dirt, spots, and marks being removed.

So:

• A mancha não saiu. literally = The stain didn’t come out.
• natural English = The stain didn’t come out or The stain didn’t wash out

This is standard Portuguese.

Other examples:

• A mancha saiu com água quente. = The stain came out with hot water.
• Esse produto tira manchas difíceis que não saem fácil. = This product removes tough stains that don’t come out easily.

So yes, sair is being used metaphorically here, much like English come out in The stain didn’t come out.

Não saiu is the simple past, and it means the speaker is talking about a completed attempt or result:

• the stain didn’t come out

This suggests that the person already tried washing it, and the result was unsuccessful.

Why not não saía?

• não saía is imperfect and would usually describe an ongoing or repeated situation, such as it wouldn’t come out or it wasn’t coming out
• não saiu is better for a single completed result

Examples:

• Lavei a camisa, mas a mancha não saiu. = I washed the shirt, but the stain didn’t come out.
• Eu esfregava, esfregava, mas a mancha não saía. = I kept scrubbing, but the stain wouldn’t come out.

And não saiu ainda would add the meaning hasn’t come out yet, which is slightly different.

Yes, but the structure would change.

Portuguese can express this idea in two common ways:

1. Using sair with the stain as the subject:

   • A mancha não saiu.
   • literally: The stain didn’t come out.

2. Using tirar with a person or product removing the stain:

   • Não consegui tirar a mancha. = I couldn’t remove the stain.
   • Esse sabão não tirou a mancha. = This soap didn’t remove the stain.

So both are natural, but they focus on different things:

• a mancha não saiu = focus on the stain/result
• não consegui tirar a mancha = focus on the person’s action

Sometimes, yes, depending on context. But usually:

• camisa often means shirt
• camiseta often means T-shirt

That said, in everyday Brazilian Portuguese, people may use camisa more broadly in some contexts, especially when the exact type of top is not important.

Examples:

• camisa social = dress shirt
• camiseta = T-shirt
• camisa de futebol = soccer jersey

So in this sentence, camisa is best understood simply as shirt, unless context tells you otherwise.

The given word order is completely natural:

• Vou deixar a camisa de molho porque a mancha não saiu.

It follows a very common pattern:

• [future intention] + [object] + [state/expression] + porque + [reason]

You could change it a little, but the original is the most neutral and natural.

For example:

• Porque a mancha não saiu, vou deixar a camisa de molho.

This is grammatical, but it sounds more marked because it starts with the reason.

In everyday conversation, speakers usually prefer the original order.

In casual speech, Brazilians might reduce or contract some sounds, but the sentence itself is already very natural.

A very everyday version could be:

• Vou deixar a camisa de molho porque a mancha não saiu.

Or even:

• Vou deixar essa camisa de molho porque a mancha não saiu.
• Vou pôr a camisa de molho porque a mancha não saiu.

Pôr de molho is also common and means basically the same thing as deixar de molho in this context.

In pronunciation, para-type reductions do not apply here, so the main thing is just natural speech rhythm:

• vou deixar
• camisa de molho
• a mancha não saiu

A good learner strategy is to memorize these pieces as chunks:

• vou + infinitive = I’m going to + verb
• deixar de molho = to leave soaking
• a mancha não saiu = the stain didn’t come out
• porque = because

These chunks will help you build many similar sentences:

• Vou deixar o feijão de molho. = I’m going to leave the beans soaking.
• Vou deixar a louça de molho. = I’m going to leave the dishes soaking.
• A sujeira não saiu. = The dirt didn’t come out.
• Vou lavar de novo porque a mancha não saiu. = I’m going to wash it again because the stain didn’t come out.