Keep the crew consistent
Knowledge of a building beats a checklist.
Not in week one. In month seven, when the crew has changed four times.
Nearly every cleaning company performs well at the start. What separates them is month seven, and the usual cause of decline is staff churn — a crew that has never seen the building before works from a checklist instead of knowledge, and nobody notices what changed.
A written scope prevents the other half of the problem. Most disputes are not about quality but about expectation: whether interior glass was included, how often the breakroom fridge gets done. Writing it down area by area removes the argument entirely.
Then someone has to inspect. A supervisor walking the building and raising issues before the client does is the whole difference between a contract that lasts years and one that ends in a complaint nobody addressed.
Knowledge of a building beats a checklist.
Most complaints are expectation gaps.
Some marks are damage, not dirt.
Free, with a written scope you can compare against other quotes.