Radio is sometimes free and as a mobile detailer you can use this to help you in your business promotions. If you work with a non-profit group in a fundraiser or event you can often get your companies name mentioned along with the non-profit group and event. Radio is good advertising, but when it is used to promote a cause you win twice when you are involved. You have the pleasure with working in the community on a project for the common good and then you receive additional business too. Public Service Announcements or PSA