Double carpet cleaning process describes the process of shampooing or heavy conditioning, then the hot water extraction>cleaning. Unfortunately, unethical Melbourne Carpet Cleaners often use dual process as a bait and switch technique. Carpet cleaning is not as cheap as some unethical Melbourne Carpet Cleaners would like you to believe.. RIP-OFF 1: UNBELIEVABLY LOW PRICE. Most people are attracted to a low price for one reason or another. However, some of the bad apples in our industry will bait you with a low price just to get in the door. This is false and misleading advertising in my book..