Have a clean office gives the impression that you are in control of your circumstances. This is good for mental health. Letting your surroundings go to ruin gives the message, most to yourself and your colleagues, that it is acceptable to be messy and disorganized. This is a slump that is hard to climb out of.
We have a different state-of-mind in untidy surroundings. Many people find that they become apathetic, unmotivated and less honest when spending long periods of time in disorganized environments. Some individuals have thicker boundaries in this regard than others, but it is hard not to absorb the feeling of our surroundings. If we stay in a disorganized environment we live and think in a disorganized way.
It can go both ways. A messy house can be the result of a depressed, unmotivated person. Or a messy space can lead a person to become depressed over time. One messy person may spread their mindset to others.
A clean office space is the best place to start work. Have the background details looked after by somebody else so you can get on with matters that are important for the running of the company.
Let a cleaning service give you a clean slate and a fresh start every morning with regular office cleaning.