I us them all the time and I have one for carpet and one for leather. They work very well and I've been using with a PC for a long time and no problems.
Dawn! Been using for years its cheap works great and you don't need to waste money. I wouldn't use APC only cause I like to save money. Dawn is so cheap a big bottle will last a long time.
First thing you need to do is get insurance to protect your self. Then get a website they don't coast much and make a face book page for your business. You can even put your business on yelp for free. I would also get business cards.
My prices start at $300 for a complete detail depends on car size and how bad paint is. Most my customers tip me after they see there cars between $50 and $100. The best advertisement is word of mouth.