@billbennet It really depends on your client base and target market. As well as the service you're offering. Older people will want to see you tidy and professional, especially if you're entering their homes for maintenance. Younger people and most blokey males will love a well cut mullet if you're otherwise clean and presentable, doing something like lawns, car stuff, clothing sales.
However, it's also in how you come across. A mate of mine has the craziest mullet, but is super personable, well dressed, capable, knowledgeable etc. People love it. Wouldnt be the same if he was awkward, greasy and unkempt.