I got this article from this website https://palmacedarcleaning.com.ng and I will recommend every one to read.
https://palmacedarcleaning.com.ng/how-to-start-a-successful-cleaning-business-in-nigeria/
From how to Have a Budget.
To How to Choose the Right Business Name and Structure. …
Company or Business name registration
Training in cleaning.
Recruitment
Purchase Cleaning Equipment. …
Set Your Rates & Your Business Model. …
Market Your Cleaning Business

and so on.

this is a piece of great information for those who are searching for tips for their business
however, it would be you good of you to share some examples of the best cleaning agencies)

There are a lot of them you should google the local ones if you need cleaning services. Good cleaning agencies are those that provide high-quality cleaning services to their clients, ensuring that their homes or offices are cleaned thoroughly and efficiently. Such cleaning agencies are professional in their approach, which means they are reliable, punctual, and efficient in their work. They should also have clear communication channels to address client concerns. Here is one example of a cleaning service I used that corresponds to these characteristics- Reinigungsfirma. I used their services in Europe and I think it is a great example.