The cleaning outsourcing contract must have been signed before it was finished. There are indeed potential problems. Signing a contract is an important legal act, which involves the rights and obligations of both parties. If you don't fully read and understand the contract terms before signing the contract, it may lead to the following problems:

1. Don't understand the rights and obligations: the terms of the contract stipulate the rights and obligations of both parties. If you don't read the contract carefully, you may ignore some important terms, resulting in damage to your rights and interests.

2. Unclear liability and breach of contract terms: Contract terms usually include provisions on liability for breach of contract and liability for compensation. If you don't read the contract carefully, you may ignore some key breach clauses, resulting in your rights and interests not being guaranteed in the case of the other party's breach of contract.

3. Suffer unfair treatment: There may be some unfair clauses in the contract. If the contract is not carefully examined, the unfavorable clauses may be ignored, resulting in unfair treatment in the execution of the contract.

Therefore, before signing a contract, you should read all the terms of the contract carefully to ensure a basic understanding of the contract content and related legal knowledge. If you have questions or are unclear, you can seek advice and answers from legal professionals to safeguard your rights and interests.