I'd like to present another direction. I understand all the implications and thought of the name "Clean Zone", but to my thinking you can do better. There are many people on this sight that have decades of experience and can offer valuable advice.
To my thinking the word "Clean" is misleading, plain and simple. The word Zone is excellent.
What you do is based on movement/transit Advertising. So why not incorporate it into your name. I would suggest words such as: Dynamic, Kinetic, Roving, Moving, Flexible, etc., all descibe yoyur sevice better than Clean.
Since you said you were open to a better name I would offer "Zone Mobile" with a tag line of "Transit Marketing" or even a longer "Targeted Transit Marketing". I think this would better describe your business.
As far as a logo, I can give the advice that after 30+ years in Advertising/Design that very few Agencies (I'm assuming you are some type of Marketing/Advertising Agency) will get overly complicated with their logo. Most will simply pick an tasteful type treatment and alter it a bit.
I think you would be better served with a more appropriate name and a simplified logo (much like Microsoft), where you alter a progressive bold san serif into a wordmark that tastefully suggests the business you are in, and when coupled with the appropriate name will serve you well for many years and you stand little chance of ever getting tired of it.
I love your thinking! I think I will take this to heart and consider it for sure...Zone Mobile will take some getting use to. Instead of "Targeted Transit Advertising" maybe two different ones..."Targeted Transit Advertising" for one, and "Targeted Outdoor Advertising" Thank you very much for your thoughts. Matt
Matt I think "Targeted Outdoor Advertising" as a tag line in perfect. You would already say mobile in your name and that would cover anything moving etc. and Zone speaks to the different areas/sectors of a city.