I must admit that when I was cheap may be 10 years ago I got referal after referal after referal, I charge more now and have just the same amount of work but get more for it, people do use me again but tend to leave it longer between cleans this may be because of money or the fact that products have got better and also machinery, around 80% of my work is past customers but the other 20% is new customers or referal, years ago it was all referal.
Shaun