Looks like their looking for a high-end detailed cleaning. The wording appears to me as if they know what they want, and don't want to go over a ton of proposals that will not meet their standards. The fact that they stated NOT to offer "group pricing" is what surprizes me; from this statement I would assume that they realize that this high-end detailed cleaning is going to have a price higher then an average cleaning. I also would imagine that once demonstrating that you can safely remove gum with a wand that they would waive that "standard", if not, I would increase the price to steer them to a second opinion. If a company sent that letter to me, they would have a detailed computer printed estimate the next day and they would get frequent phone calls.