După curățenie, oaspeții vor vedea că totul este în ordine.

It means after the cleaning or more naturally in English, after cleaning up.

• după = after
• curățenie = cleaning, tidying, housework, cleanup

In this sentence, curățenie is being used in a general sense, so Romanian does not need an article here.

Romanian often uses a noun where English might prefer a verb phrase.

So instead of saying something like after to clean, Romanian naturally says:

• după curățenie = after the cleaning / after cleaning up

This is idiomatic and very common.
A learner should think of curățenie here as the activity of cleaning, not just the abstract idea of cleanliness.

Because oaspeții means the guests, and Romanian adds the definite article to the end of the noun.

Breakdown:

• oaspete = guest (singular)
• oaspeți = guests (plural, indefinite)
• oaspeții = the guests (plural, definite)

So the extra -ii is not random. It comes from:

1. the plural form oaspeți
2. plus the definite article for plural nouns

This is a very common Romanian pattern.

Vor vedea is the future tense: will see.

It is made from:

• vor = they will
• vedea = see

So:

• a vedea = to see
• vor vedea = they will see

This is one of the standard Romanian future constructions:

• voi vedea = I will see
• vei vedea = you will see
• va vedea = he/she will see
• vom vedea = we will see
• veți vedea = you all will see
• vor vedea = they will see

Că means that and introduces a subordinate clause.

So:

• oaspeții vor vedea = the guests will see
• că totul este în ordine = that everything is in order

Just like English, Romanian often uses that/că after verbs of saying, knowing, seeing, believing, and so on.

Totul is the normal Romanian word for everything.

It comes from tot = all / whole / everything, with the ending -ul giving it the sense of the whole thing / everything.

So in this sentence:

• totul = everything

A learner may wonder about toate, but that usually means all in a plural sense, like all of them or all things. Here Romanian is treating everything as one whole, so totul is the natural choice.

Because totul is grammatically singular.

• totul este = everything is
• sunt would mean are

Even in English, everything takes a singular verb: everything is, not everything are.

Also, Romanian often shortens este to e in everyday speech:

• totul este în ordine
• totul e în ordine

Both are correct. Este sounds a bit fuller or slightly more formal.

În ordine literally means in order, but in real usage it can mean several related things:

• tidy
• organized
• in order
• okay / fine

In this sentence, it most likely means that everything is neat and properly arranged after the cleaning.

So the idea is: the guests will see that everything is tidy and as it should be.

Yes, it is natural here because După curățenie is an introductory time phrase.

• După curățenie, oaspeții vor vedea...

The comma helps separate that opening phrase from the main clause.

In some short Romanian sentences, writers may omit such commas, but here the comma is clear and standard. For a learner, it is a good model to follow.

Yes. Romanian word order is fairly flexible.

The sentence given is:

• După curățenie, oaspeții vor vedea că totul este în ordine.

You could also say:

• Oaspeții vor vedea, după curățenie, că totul este în ordine.

But the original version is the most natural if you want to emphasize when they will see it: after the cleaning.

So the fronted phrase După curățenie sets the scene first.

It can mean both, depending on context.

• a face curățenie = to do the cleaning / to tidy up
• este curățenie = it is clean / there is cleanliness/order

In this sentence, după curățenie clearly refers to the act/process of cleaning up, not just the abstract state of cleanliness.

A slightly more conversational version might be:

• După curățenie, oaspeții vor vedea că totul e în ordine.

The main difference is:

• este → e

This is very common in spoken Romanian. The original sentence is fully correct and natural, just a bit more complete in style.