Jos pesula ei saa tahraa pois, käytän paitaa silti kotona.

Jos means if and introduces a conditional clause.

So Jos pesula ei saa tahraa pois is the if-clause, and käytän paitaa silti kotona is the main clause.

Finnish uses jos very much like English if.

Because the sentence starts with a subordinate clause:

Jos pesula ei saa tahraa pois, ...

In Finnish, when a subordinate clause comes before the main clause, it is normally separated by a comma. This is standard punctuation.

Pesula is the subject of the clause, so it is in the nominative, the basic dictionary form.

Here it means something like the laundry, the cleaners, or the dry cleaner, depending on context.

So:

• pesula = the subject, the place/service doing the cleaning

This is the normal Finnish negative structure:

• ei = the negative auxiliary
• saa = the main verb in its special negative form

In Finnish, you do not usually negate a verb with a separate word like English not. Instead, the negative verb is conjugated.

Here:

• pesula ei saa = the laundry does not manage to get / cannot get

A useful extra point: saada can mean several things, including get, receive, or be allowed to, but in this sentence, with pois, it means something like manage to remove or get out.

Because the clause is negative.

In Finnish, a direct object often changes to the partitive in negative sentences. So:

• positive: pesula saa tahran pois = the laundry gets the stain out
• negative: pesula ei saa tahraa pois = the laundry does not get the stain out

So tahraa is the partitive singular of tahra.

This is a very common pattern in Finnish:

• negative clause → object often in the partitive

Pois means away, off, or out, depending on context.

With saada, it forms the expression saada pois, which means:

• get rid of
• remove
• get out/off

So saa tahran pois is literally something like gets the stain away/out, meaning removes the stain.

Yes. Käyttää can mean both use and wear.

With clothes, it commonly means wear.

So:

• käytän paitaa = I wear the shirt

This is very normal Finnish.

Because käyttää usually takes a partitive object when it means use or wear.

So with clothing, Finnish normally says:

• käytän paitaa
• käytän takkia
• käytän hattua

This is not because the clause is negative; the clause is actually positive here. It is simply how käyttää commonly works with this meaning.

So paitaa is the partitive singular of paita.

Because Finnish has no articles.

There is no direct equivalent of English a or the in normal Finnish grammar. So paitaa can mean:

• a shirt
• the shirt

The exact meaning depends on context.

In this sentence, context probably makes it clear that it means the shirt.

Silti means still, nevertheless, or anyway.

It adds the idea of contrast:

• even if the stain does not come out, I’ll still wear the shirt at home

So silti is doing the job of English words like:

• still
• even so
• nevertheless
• anyway

Finnish word order is more flexible than English word order, especially with adverbs like silti.

This sentence is natural as:

käytän paitaa silti kotona

But you could also hear slightly different placements depending on emphasis, for example:

• käytän silti paitaa kotona
• silti käytän paitaa kotona

The version in the sentence sounds natural and keeps the focus smooth: first the action and object, then the contrast word, then the place.

Kotona means at home.

Finnish has a special set of very common forms for koti:

• kotona = at home
• kotiin = to home / homeward
• kotoa = from home

So here kotona is used because the meaning is location:

• I wear the shirt at home

Not movement toward home, so kotiin would not fit.

Because Finnish does not have a separate future tense like English.

The present tense is often used for future meaning when the context makes it clear. That is exactly what is happening here.

So:

• Jos pesula ei saa tahraa pois, käytän paitaa silti kotona.

can naturally mean:

• If the laundry can’t get the stain out, I’ll still wear the shirt at home.

This is completely normal Finnish.

Yes, and that is a good thing to notice.

Saada often means to be allowed to, for example:

• Saan mennä = I’m allowed to go

But in this sentence, that is not the meaning. Because it is used with tahraa pois, the meaning is about managing to remove something:

• ei saa tahraa pois = can’t get the stain out

So the surrounding words tell you which meaning of saada is intended.

Most likely one specific shirt, but Finnish does not mark that with an article.

The context probably gives that meaning. English would often say the shirt, but Finnish just says paitaa.

So the sentence itself does not force a distinction between a shirt and the shirt the way English does. Context does that work instead.