The best and closest true full service detailing service is Portland Detailing.
http://www.portlanddetailing.com/
It's $195 and the do the wheel wells, etc. They do Ferraris and similar cars and I had them do Mustang. From Wolfeboro they are way closer than Nashua, etc.
The way I have preserved all my cars is every spring I put my vehicles on stands and use a pressure washer to get all the grit off the under carriage. That calcium products used today actually pull moisture from air and creates non stop corrosion if you don't get it off the car. After doing three cars every year I have several dust pans full of grit to sweep off driveway when done. Make you understand why so many cars have rusted frames in 10 years or less.
If you go to Fox Run mall the car was in Newimgton is decent for quickie wash.