Después de lavarme el pelo, siempre uso acondicionador.

Lavarme is the infinitive lavar plus the reflexive/object pronoun me attached to the end.

• lavar = to wash
• lavarme = to wash myself / to wash my own

After después de, Spanish normally uses an infinitive, so después de lavarme means after washing my... or more naturally in English, after I wash my...

Attaching the pronoun to the infinitive is completely normal:

• antes de ducharme = before showering
• después de peinarme = after combing my hair

Because after después de, Spanish usually uses:

• después de + infinitive when the subject is the same
• después de que + conjugated verb when you want a full clause

So this sentence uses:

• Después de lavarme el pelo... = After washing my hair... / After I wash my hair...

You cannot say después de me lavo.

A full alternative would be:

• Después de que me lavo el pelo, siempre uso acondicionador.

That is also correct, but después de + infinitive is very common and often more natural when the subject stays the same.

This is a very common Spanish pattern with body parts.

Spanish often uses:

• an indirect/reflexive pronoun (me, te, se, nos, os)
• plus the definite article (el, la, los, las)

instead of a possessive like my, your, etc.

So:

• me lavo el pelo literally looks like I wash the hair to myself
• but it really means I wash my hair

More examples:

• Me lavo las manos. = I wash my hands.
• Se cepilla los dientes. = He/She brushes his/her teeth.
• Nos duele la cabeza. = Our head hurts / We have a headache.

Using mi pelo is not impossible, but in this kind of sentence el pelo is the normal choice.

Me shows that the action is being done to the speaker.

In this sentence, the person who washes is also the person whose hair is being washed. That is why Spanish uses me.

Compare:

• Lavo el pelo del perro. = I wash the dog’s hair/fur.
• Me lavo el pelo. = I wash my hair.

So me is essential here. Without it, the sentence would sound like you are just washing hair in general, not specifically your own.

Spanish often leaves out subject pronouns because the verb ending already shows who the subject is.

• uso = I use

So yo is not necessary.

Spanish speakers add yo only when they want emphasis, contrast, or clarity:

• Yo siempre uso acondicionador, pero mi hermano no.

In a normal neutral sentence, siempre uso acondicionador is more natural than yo siempre uso acondicionador.

Siempre is an adverb, and in Spanish it is very commonly placed before the conjugated verb:

• siempre uso
• siempre como
• siempre voy

So:

• siempre uso acondicionador = I always use conditioner

Other positions are sometimes possible, but this is the most standard and natural one here.

In Spanish, when talking about things you use in a general sense, it is very common to have usar + noun with no article.

So:

• uso acondicionador = I use conditioner

This is similar to English, where conditioner can be uncountable in this context.

Other options change the meaning a bit:

• uso un acondicionador = I use a conditioner / one conditioner product
• uso el acondicionador = I use the conditioner, meaning a specific one

So in this sentence, no article sounds natural because it means the product in general.

Yes. Acondicionador is the standard word for hair conditioner.

In Spain, you may also hear product labels like:

• acondicionador
• suavizante in some contexts, though this can vary and is less neutral for learners

For everyday learning, acondicionador is a safe and widely understood word.

Both can refer to hair, but there is a difference in tone and usage.

• pelo is very common in everyday speech
• cabello can sound a bit more formal, descriptive, or stylistic

So:

• lavarme el pelo sounds very natural and conversational
• lavarme el cabello is also correct, but less everyday in many contexts

For a learner, pelo is a very useful default word.

Yes, that is grammatically correct.

It uses:

• después de que
  • conjugated verb

So both are possible:

• Después de lavarme el pelo, siempre uso acondicionador.
• Después de que me lavo el pelo, siempre uso acondicionador.

The first one is shorter and very natural when the subject is the same in both parts of the sentence.

Yes. Spanish is fairly flexible with word order, especially with time expressions like this.

These are both natural:

• Después de lavarme el pelo, siempre uso acondicionador.
• Siempre uso acondicionador después de lavarme el pelo.

The first version emphasizes the sequence after washing my hair. The second version emphasizes I always use conditioner.

Both mean essentially the same thing.

Because the correct spelling is después with a written accent on the final é.

It is just part of the standard spelling of the word. You need to memorize it that way:

• después = after / afterwards

The accent mark helps show the correct stress in pronunciation.

A simple pronunciation guide is:

des-PWES de la-VAR-me el PE-lo, syEM-pre OO-so a-con-di-cio-na-DOR

A few helpful notes:

• después has the stress on the last syllable: -pués
• lavarme stresses var
• pelo stresses pe
• siempre stresses siem
• uso stresses u
• acondicionador stresses the last syllable: -dor

In much of Spain, c before i in acondicionador is pronounced with the th sound of thin:

• a-kon-di-thyo-na-DOR

But learners will be understood even if they use an s sound instead.