Als u straks thuiskomt, zal ik het aanrecht hebben schoongemaakt en het wasmiddel hebben opgeborgen.

This is the future perfect.

It is built with:

• zullen for the future: zal
• the auxiliary infinitive: hebben
• the past participle: schoongemaakt, opgeborgen

So the pattern is basically:

zal + subject + ... + hebben + past participle

It means that the actions will be finished before a point in the future. Here, that future point is when you get home later.

Because Dutch is a V2 language in main clauses: the finite verb has to be in the second position.

The opening part Als u straks thuiskomt counts as the first element of the sentence. So after that, the finite verb must come next:

• Als u straks thuiskomt, zal ik ...

If there were no opening als-clause, you could say:

• Ik zal het aanrecht hebben schoongemaakt ...

Because Als u straks thuiskomt is a subordinate clause, introduced by als. In Dutch subordinate clauses, the conjugated verb usually goes to the end.

So:

• main clause: U komt straks thuis
• subordinate clause: als u straks thuiskomt

That is a very common Dutch word-order pattern.

Because thuiskomen behaves like a separable verb.

• In an infinitive, it is one word: thuiskomen
• In a main clause with a finite verb, it often splits: u komt thuis
• In a subordinate clause, it joins again: als u thuiskomt

So all of these belong together:

• thuiskomen
• u komt thuis
• als u thuiskomt

Here it is best understood as when.

Dutch als can mean both if and when, depending on context. In this sentence, the meaning is not really conditional or doubtful. It refers to an expected future moment: when you get home later.

You could also use wanneer here, but als is very common and natural.

Straks usually means something like:

• later
• in a little while
• soon

It often refers to the near future, especially later today or later in the current situation.

So Als u straks thuiskomt is something like When you get home later.

It does not mean immediately now. It suggests a bit of time between now and that future moment.

U is the formal Dutch word for you.

It is used:

• in polite situations
• with customers, strangers, older people, etc.
• in more formal speech or writing

So this sentence sounds polite and respectful.

If you were speaking informally to a friend or family member, you would probably use je or jij instead.

Because schoonmaken and opbergen normally form the perfect tense with hebben.

That is because they are transitive verbs: they take a direct object.

• het aanrecht schoonmaken
• het wasmiddel opbergen

In Dutch, verbs that take an object usually use hebben in the perfect.

By contrast, verbs like gaan, komen, and vallen often use zijn.

Both come from separable verbs:

• schoonmaken
• opbergen

With separable verbs, the past participle often puts ge between the first part and the verb stem:

• schoon + gemaakt → schoongemaakt
• op + geborgen → opgeborgen

Compare the main-clause forms:

• Ik maak het aanrecht schoon
• Ik berg het wasmiddel op

So the sentence shows the same verbs in participle form.

Because there are two coordinated completed actions:

• het aanrecht hebben schoongemaakt
• het wasmiddel hebben opgeborgen

Repeating hebben makes the structure clear and balanced. It is the normal, safe way to say it.

In other words, each action has its own full future-perfect verb group.

• het aanrecht = the kitchen counter, countertop, or sometimes the sink/worktop area
• het wasmiddel = detergent, usually laundry detergent unless the context suggests otherwise

Both nouns take the article het, so they are neuter nouns.

It is definitely grammatical and natural, but it sounds a bit careful or formal because of two things:

• the use of u
• the future perfect, which is slightly more formal or explicit than simpler everyday wording

So it fits well in polite speech, instructions, or more formal conversation. In casual everyday speech, Dutch speakers often choose a lighter structure if the context already makes the timing clear.

A useful way to see it is:

• Als u straks thuiskomt = subordinate time clause
• zal = finite verb of the main clause
• ik = subject
• het aanrecht / het wasmiddel = objects
• hebben schoongemaakt / hebben opgeborgen = non-finite verb groups at the end

So the overall pattern is:

[subordinate clause], [finite verb] [subject] [other elements] [verb cluster]

That is a very typical Dutch sentence pattern.