Pro Detailer vs Car Washer?
This is an age old debate, the bottom line is that a car washer is going to promise the sun and moon and the Pro will tell you de facto what can and can not be done. On the flip side, the car washer might not be able to handle the job at hand and will tell you that no one can do what is asked, but a Pro will tell you if they can handle it or if it needs to go to the local bodyshop for repair.
The second idea is that a car washer will typically use products that are designed expressly for car washing systems. High gloss tire dressings that sling off down the side of your car, super slippery interior dressings that attract dust and smear when you touch a dressed panel, waxes that are known as Spray-On that won't really last more than 4-5 washes at best, etc.
The products we use are time tested by the top detailers in the world. Period.