Uansett hvem som bruker dreieskiven, må forkleet være rent.

Uansett means regardless, no matter, or in any case depending on context.

Here it introduces the idea that the rule stays true no matter who the person is:

Uansett hvem som bruker dreieskiven
= No matter who uses the wheel/disc

It is a very common word in Norwegian for showing that something does not change even if another detail changes.

You will often see patterns like:

• uansett hvem = no matter who
• uansett hva = no matter what
• uansett hvor = no matter where
• uansett om = regardless of whether

Because this is not a direct question. It is an embedded clause inside a larger sentence.

Compare:

• Direct question: Hvem bruker dreieskiven?
  = Who uses the wheel/disc?

• Embedded clause: uansett hvem som bruker dreieskiven
  = no matter who uses the wheel/disc

In Norwegian, when the question word is the subject of an embedded clause, som is normally used:

• Jeg vet hvem som kommer. = I know who is coming.
• Det spiller ingen rolle hvem som betaler. = It doesn’t matter who pays.

So hvem som bruker is the normal and correct pattern here.

In this sentence, som helps introduce the embedded clause after hvem.

A useful way to think about it is:

• hvem som bruker = who it is that uses / who uses

In English, we usually do not need an extra word here, but Norwegian often does.

A helpful contrast:

• Jeg vet hvem som kommer.
  The unknown person is the subject of kommer, so som appears.

• Jeg vet hvem du kjenner.
  Here du is the subject, and hvem is the object, so there is no som.

So in your sentence, because hvem is the one doing the using, som is used.

Norwegian often uses the present tense for general truths, rules, habits, and repeated situations.

So hvem som bruker dreieskiven does not mean only who is using it right now. It means whoever uses it, in a general sense.

This is very natural in Norwegian and English alike:

• Who uses the machine
• Whoever uses the machine
• No matter who uses the machine

All of these can refer to a general rule, not only a present-moment action.

Dreieskiven is the definite singular form of dreieskive.

So:

• dreieskive = a wheel/disc/turning plate
• dreieskiven = the wheel/disc/turning plate

Norwegian usually adds definiteness to the end of the noun instead of using a separate word like the.

So where English says the wheel, Norwegian often says:

• noun + definite ending

Here that gives dreieskiven.

Also, many nouns that can be feminine in Bokmål may appear with either a feminine or common-gender definite ending depending on style. So with some words you may see both forms in real life. In this sentence, dreieskiven is perfectly normal Bokmål.

Because Norwegian often expresses the by adding an ending directly to the noun.

So:

• et forkle = an apron
• forkleet = the apron

and

• en/ei dreieskive = a wheel/disc
• dreieskiven = the wheel/disc

This is one of the most important differences from English. The noun itself often carries the meaning of the.

This is because Norwegian follows the V2 rule in main clauses: the finite verb usually comes in the second position.

The basic statement would be:

• Forkleet må være rent.
  = The apron must be clean.

But in your sentence, the clause Uansett hvem som bruker dreieskiven is placed first. Once that whole clause takes first position, the finite verb of the main clause must come next:

• Uansett hvem som bruker dreieskiven, må forkleet være rent.

So the order is:

1. fronted clause
2. finite verb (må)
3. subject (forkleet)

This is very standard Norwegian word order.

Because the sentence begins with a subordinate clause, and Norwegian normally places a comma between that clause and the main clause.

So the structure is:

• subordinate clause: Uansett hvem som bruker dreieskiven
• main clause: må forkleet være rent

The comma helps show that transition.

Because after modal verbs such as må, Norwegian uses the bare infinitive without å.

So:

• må være = must be
• kan bruke = can use
• skal gå = will/is going to go
• vil lære = want to learn / will learn

This is similar to English, where we say must be, not must to be.

Forkleet is the definite singular form of the neuter noun forkle.

So:

• et forkle = an apron
• forkleet = the apron

The noun forkle is neuter, and that matters for the adjective later in the sentence.

You may notice the spelling:

• forkle
  • -et → forkleet

That is just the normal written form when the noun already ends in -e.

Because the adjective must agree with the noun forkleet, and forkle is a neuter singular noun.

The adjective ren changes like this:

• ren = common gender singular
• rent = neuter singular
• rene = plural / definite contexts in some uses

Since forkleet is neuter singular, the correct form is:

• Forkleet må være rent.

A very important point: this is a predicative adjective after være, so it still agrees in gender and number, but it does not take a special definite form just because the noun is definite.

Compare:

• et rent forkle = a clean apron
• forkleet er rent = the apron is clean

Both use rent because the noun is neuter singular.

Yes. Må usually expresses necessity, obligation, or something required.

In this sentence, it sounds like a rule or requirement:

• må være rent = must be clean

So the meaning is not just should preferably be clean. It is stronger than that.

If Norwegian wanted a softer meaning, it might use something like bør in another context:

• bør være rent = should be clean

But må clearly gives a sense of requirement.

Yes. A very natural alternative is:

Forkleet må være rent, uansett hvem som bruker dreieskiven.

This puts the main point first and the uansett clause afterward.

Both versions are correct. The difference is mostly about emphasis and flow:

• Uansett hvem som bruker dreieskiven, må forkleet være rent.
  Emphasizes regardless of who the user is

• Forkleet må være rent, uansett hvem som bruker dreieskiven.
  Emphasizes the rule itself

So the sentence you were given is not unusual; it just foregrounds the regardless of who part.