Τα πλακάκια στο μπάνιο γλιστράνε όταν πέφτει νερό, γι’ αυτό τα σκουπίζω αμέσως με ένα πανί.

Greek often drops subject pronouns when they are clear from the verb ending.

• σκουπίζω = I wipe / I dry
• The ending -ω already tells you the subject is I

So Greek usually does not need εγώ unless the speaker wants emphasis:

• Τα σκουπίζω = I wipe them
• Εγώ τα σκουπίζω = I’m the one who wipes them

Τα πλακάκια means the tiles.

• πλακάκι = tile
• πλακάκια = tiles (plural)
• τα = the article used with neuter plural nouns

So:

• το πλακάκι = the tile
• τα πλακάκια = the tiles

Greek nouns have gender, and πλακάκι is neuter, so its plural article is τα.

στο is a contraction of σε + το.

• σε = in / at / to
• το = the
• στο = in the / at the / to the

So:

• στο μπάνιο = in the bathroom

This contraction is extremely common in Greek:

• σε το σπίτι → στο σπίτι
• σε την πόλη stays στην πόλη (different article)

Here μπάνιο is neuter singular, so σε το μπάνιο becomes στο μπάνιο.

It can mean either, depending on context.

• το μπάνιο can mean the bathroom
• it can also mean the bath / bathing / swim, depending on the sentence

In στο μπάνιο, with πλακάκια and water on the floor, it clearly means the bathroom.

Because the subject is plural: τα πλακάκια.

• γλιστράει / γλιστρά = it slips / is slippery
• γλιστράνε = they slip / are slippery

So Τα πλακάκια ... γλιστράνε means The tiles are slippery / the tiles slip.

Also, γλιστράνε is a very common everyday spoken form. You may also see more formal or alternative forms such as:

• γλιστρούν
• sometimes γλιστράν

All of these can mean they slip / they are slippery.

Because this sentence describes a general situation / habitual action, not one single event.

• Τα πλακάκια ... γλιστράνε όταν πέφτει νερό = a general truth
• τα σκουπίζω αμέσως = what I usually do in that situation

This is similar to English:

• Tiles get slippery when water falls on them, so I wipe them immediately.

Greek often uses the present tense for things that happen regularly or are generally true.

Yes, literally it is when water falls, but in natural Greek πέφτει νερό can mean that water falls, spills, lands, or gets on something.

So in this sentence:

• όταν πέφτει νερό = when water gets on them / when water is spilled / when water falls

This is a normal Greek way to express the idea. English usually phrases it differently, but the Greek expression is natural.

Also note that πέφτει is singular because its subject is νερό (water), which is singular.

Because Greek often leaves out the article with a mass noun when speaking generally.

• πέφτει νερό = water falls / water gets on it
• not the water, but water in general

If the speaker meant specific water already mentioned, they might say το νερό. But here the meaning is general: whenever water gets on the tiles.

γι’ αυτό means for this reason, so, or that’s why.

It connects the first idea to the result:

• The tiles get slippery when water gets on them; that’s why I wipe them immediately.

It comes from για αυτό, but in normal writing and speech it is very often shortened to γι’ αυτό.

The apostrophe shows that a vowel has been dropped in pronunciation and spelling.

• full form: για αυτό
• shortened form: γι’ αυτό

This kind of shortening is common in Greek, especially in everyday language.

So the apostrophe is not random punctuation; it marks a contraction.

That τα is not the article the. It is a direct object pronoun meaning them.

It refers back to τα πλακάκια:

• τα πλακάκια = the tiles
• τα σκουπίζω = I wipe them

In Greek, object pronouns usually come before the verb:

• τον βλέπω = I see him
• την ξέρω = I know her
• τα σκουπίζω = I wipe them

So here τα = them.

It can mean either, depending on context.

Common meanings of σκουπίζω include:

• wipe
• dry
• sweep

In this sentence, because the tiles are wet and the speaker uses ένα πανί (a cloth), the meaning is clearly:

• I wipe them
• or I dry them off

If the sentence had a broom, then σκουπίζω would be more like sweep.

αμέσως means immediately / right away.

It tells you when the speaker wipes the tiles:

• τα σκουπίζω αμέσως = I wipe them immediately

Greek adverbs are fairly flexible in position, but this placement is very natural.

με ένα πανί means with a cloth.

• με = with
• ένα = a / one
• πανί = cloth / rag

After με, Greek uses the accusative case. Here:

• ένα πανί is accusative singular

Because πανί is neuter, its nominative and accusative forms look the same, so you do not see a spelling change here.

Not as fixed as in English. Greek word order is more flexible because endings and articles show grammatical roles.

This sentence has a very natural order:

• Τα πλακάκια στο μπάνιο γλιστράνε όταν πέφτει νερό, γι’ αυτό τα σκουπίζω αμέσως με ένα πανί.

But parts can move for emphasis. For example, αμέσως could be moved earlier if the speaker wants to stress how quickly they act.

Even so, the version you have is a very normal, natural way to say it.