Puliamo la guarnizione del gruppo con lo spazzolino di pulizia.

It can mean either one, depending on context.

• Present tense: we clean / we are cleaning
• 1st person plural imperative: let’s clean

In practical instructions, Italian often uses this form to mean let’s ..., especially in demonstrations or manuals.

So in a step-by-step context, Puliamo la guarnizione... is very naturally understood as Let’s clean the gasket...

The verb is from pulire = to clean.

Italian usually uses an article where English sometimes does too, and sometimes does not.

Here, la guarnizione means the gasket.

That article is there because Italian normally wants a definite article before a specific noun:

• la guarnizione = the gasket
• il gruppo = the group / group head
• lo spazzolino = the brush

Even in technical instructions, Italian often sounds more natural with the article than without it.

Del is a contraction of:

• di = of
• il = the

So:

• del gruppo = of the group

This is extremely common in Italian:

• di + il = del
• di + la = della
• di + lo = dello
• di + l’ = dell’
• di + i = dei
• di + gli = degli
• di + le = delle

So la guarnizione del gruppo literally means the gasket of the group.

Because spazzolino begins with s + consonant (sp), and masculine singular nouns with that kind of beginning usually take lo, not il.

Examples:

• lo spazzolino
• lo studente
• lo specchio
• lo zaino

Compare:

• il libro
• il gruppo

So the article changes according to the sound that follows.

Spazzolino literally means small brush.

It comes from:

• spazzola = brush
• spazzolino = little brush / small brush

In context, it often means a cleaning brush or a brush tool, depending on what kind of object is being discussed.

The ending -ino is a very common Italian diminutive ending.

Italian often uses di + noun where English uses a noun as an adjective.

So:

• spazzolino di pulizia = cleaning brush
• literally: brush of cleaning

This pattern is very common:

• prodotto di pulizia = cleaning product
• macchina da caffè = coffee machine
• spazzola da denti = toothbrush

English often stacks nouns together; Italian usually prefers a structure like di, da, or an adjective.

Con means with.

It introduces the tool or instrument used to do the action:

• Puliamo la guarnizione con lo spazzolino di pulizia
• We clean the gasket with the cleaning brush

So con lo spazzolino di pulizia tells you how or with what the cleaning is done.

It describes the action of cleaning, not the gasket.

In other words, it means:

• We clean the gasket using the cleaning brush

It does not mean:

• the gasket with the cleaning brush

So grammatically, this prepositional phrase is functioning as an instrument phrase linked to puliamo.

Yes, it could be changed, but the given order is the most neutral and natural.

Standard order here is:

• Verb
  • direct object
    • extra information
• Puliamo
  • la guarnizione del gruppo
    • con lo spazzolino di pulizia

Italian word order is more flexible than English, but not all options sound equally natural. For example:

• Con lo spazzolino di pulizia, puliamo la guarnizione del gruppo.

This is also correct, but it puts more emphasis on the tool.

The original sentence sounds like a straightforward instruction.

Yes. Pulire is a regular -ire verb.

Its present tense is:

• io pulisco = I clean
• tu pulisci = you clean
• lui/lei pulisce = he/she cleans
• noi puliamo = we clean
• voi pulite = you all clean
• loro puliscono = they clean

Notice the pattern:

• singular forms and loro use -isc-
• noi and voi do not

So puliamo is the normal noi form.

Because Italian generally uses articles more often than English, especially with specific objects and technical nouns.

Here you get:

• la guarnizione
• del gruppo
• lo spazzolino

English might sometimes say something shorter like Clean group gasket with cleaning brush, especially in labels or manuals. Italian usually sounds more natural with the articles included.

So for learners, a good rule is:

• when in doubt, Italian often prefers the article where English might omit it.

It is the same word, but in this context it is being used in a technical sense.

In coffee-machine language, gruppo often refers to the brew group / group head. So guarnizione del gruppo is a specific technical part: the gasket belonging to that unit.

This is common in Italian: an everyday word can have a specialized meaning in a technical context.