I live right next to NWAS. They are awesome(they did my tint), and so is metropolitan detail. However, I find both of them incredibly expensive, which is completely justifiable. I used this guy, Jared, and he did a wonderful job doing a full detail and opticoat (I bought a loaner so my paint was swirled). Cost me $450, when it would have cost me something like 950 at NWAS. Only downside is that he might be booked for a bit.
Dynamic Mobile Detailing | Home | Kirkland | Seattle
If money is absolutely zero issue, then you are in good hands at either of the above places. They are excellent and have extremely high attention to detail (the wraps done by Northwest auto salon are insane, and they work on incredibly expensive cars all the time). However, for something as simple as a detail and opticoat, I personally looked elsewhere.