If you cannot name the deliverable, you do not have an engagement
"We'll clean it up" is not a scope. A cleanup has pieces you can hold. You should know what they are before you approve a price, and you should be able to check them when they come back.
Book cleanups are that engagement for a file that is behind, messy, or both. The work is done for you. A licensed CPA reviews it before it is delivered. This post is the list of what "delivered" means, so you are not buying a mood.
First you get a diagnostic, not a production bill
The diagnostic is $499. It is a read-only review of the records. You get findings with dollar amounts: what does not tie, what is missing, what it would cost to fix. The $499 credits toward the cleanup if you move forward.
Nothing in the file is changed while that review is happening. You are not asked to approve a rebuild you have not read. What happens after the $499 diagnostic is the sequence in more detail. The short version: findings, a fixed quote, then production only after you accept the quote in writing.
If the findings say the file should be rebuilt from the statements instead of patched, you will see that. A cleanup quote and a start-over quote are not the same product. You should be able to tell which one is in front of you.
Then you get books that tie, plus the open items
After you approve the quote, the cleanup produces books for the period in scope. Cash and the other accounts that can be tied should tie to the statements. Categories should follow the support you have, not a guess that makes the profit look calmer.
You also get the items that could not be finished. A missing statement. A personal charge with no note. A loan payment that might be principal, interest, or both, and nobody has the amortization. Those stay open, in writing. An engagement that reports "all set" while hiding the open items is not finished. It is optimistic.
A licensed CPA reviews the package before you receive it. That review is part of the delivery, not an extra you have to request.
What a sample can show you, and what it cannot
If you want to see the shape of a finished monthly package before you send your own file, look at the sample deliverables. The sample is labeled as a sample. The company in it is not a real client. The figures are there so you can see statements, reconciliations, and a reasoning log, not so you can compare your revenue to a fictional one.
A cleanup of a behind file is not a copy of that sample month. Your period may be longer. Your holes will be your holes. The sample is the form of the work, not a promise that your file looks like the illustration.
What is not in the box
The cleanup does not file your tax return. It does not call the IRS. It does not talk to your lender or your buyer unless you have asked for a package they can read, and even then the conversation stays yours.
It does not include a monthly bookkeeping relationship unless you ask for one after the file is current. Catch-up and a standing monthly close are different. Do not let them be invoiced as one blur.
And it does not include a price that moves after you have approved the quote. The number you accept is the number you pay. If the records you send are not the records that were diagnosed, the scope can be rewritten before more work starts. It should not be rewritten in silence.
When you are ready to see the findings on your own file, start with a book cleanup. Read the diagnostic. Then decide.