El abrigo de lana está limpio, pero prefiero llevarlo a la tintorería.

Because limpio here describes a current condition of the coat, not one of its essential characteristics.

• estar + adjective = a state or condition
• ser + adjective = a more permanent or defining quality

So El abrigo está limpio means The coat is clean (right now).

If you said es limpio, it would sound more like it is clean by nature or it is a clean kind of item/person, which does not fit well here.

De lana means made of wool.

In Spanish, material is very often expressed with de + material:

• un abrigo de lana = a wool coat
• una mesa de madera = a wooden table
• un vaso de vidrio = a glass cup

This is more common than trying to turn the material into an adjective in many cases.

Because abrigo is a masculine noun in Spanish, so it takes el.

• el abrigo
• un abrigo

This also affects other words that agree with it, such as limpio:

• El abrigo está limpio
• not limpia

Because limpio agrees with abrigo, and abrigo is masculine singular.

Agreement in Spanish usually works like this:

• masculine singular: limpio
• feminine singular: limpia
• masculine plural: limpios
• feminine plural: limpias

So:

• El abrigo está limpio
• La camisa está limpia

Because preferir is a stem-changing verb. In the present tense, the e in the stem changes to ie in most forms.

Present tense of preferir:

• yo prefiero
• tú prefieres
• él/ella prefiere
• nosotros preferimos
• vosotros preferís
• ellos/ellas prefieren

So prefiero means I prefer.

Lo is a direct object pronoun meaning it, and it refers back to el abrigo.

So:

• llevar = to take
• llevarlo = to take it

This avoids repeating el abrigo:

• prefiero llevar el abrigo a la tintorería
• prefiero llevarlo a la tintorería

Both are correct, but using lo sounds more natural once the coat has already been mentioned.

Yes. With an infinitive like llevar, the object pronoun can usually be either:

1. attached to the infinitive
   
   • prefiero llevarlo
2. placed before the conjugated verb
   
   • lo prefiero llevar

However, in this sentence, prefiero llevarlo sounds much more natural.

Spanish commonly attaches object pronouns to:

• infinitives: llevarlo
• gerunds: llevándolo
• affirmative commands: llévalo

Here, a simply means to.

• llevar algo a un sitio = to take something to a place

So:

• llevarlo a la tintorería = to take it to the dry cleaner’s

This is not the so-called personal a. It is just the normal preposition used with movement toward a destination.

In Spain, la tintorería usually means the dry cleaner’s or dry-cleaning shop.

So the sentence suggests something like: the coat is clean, but the speaker still prefers to take it to a professional cleaner.

A useful contrast:

• tintorería = dry cleaner’s
• lavandería = laundry / laundromat, depending on context

Pero means but and introduces a contrast.

The contrast is:

• The wool coat is clean
• but I still prefer to take it to the dry cleaner’s

So even though the coat is already clean, the speaker chooses professional cleaning anyway.

Because after de to express material, Spanish normally does not use an article.

So you say:

• de lana = of wool / wool
• de algodón = of cotton
• de cuero = of leather

Using an article here, like de la lana, would usually suggest a more specific meaning, such as made from the wool of some particular wool already mentioned.

Yes, but the meaning changes.

• quiero llevarlo = I want to take it
• prefiero llevarlo = I prefer to take it

Prefiero implies a comparison, even if the alternative is not stated explicitly. For example, the unstated idea could be:

• I prefer taking it to the dry cleaner’s rather than washing it at home.
• I prefer taking it there even though it looks clean.

So prefiero adds the idea of preference, not just desire.

Yes, llevar is the normal verb here.

• llevar = to take / carry something away to another place
• traer = to bring something toward the speaker or destination being treated as here

Since the speaker is talking about taking the coat to the dry cleaner’s, llevar fits naturally:

• llevarlo a la tintorería = take it to the dry cleaner’s

Using traer would change the perspective and would usually not fit this sentence.