Nothing beats a hand wash & dry by the owner.
Everything else is liable to result in disappointment and a degraded finish over the longer term.
Honestly its such a small area of car to wash it can be easily done in less than 30 minutes.
Always wipe parallel to the wind flow, never circles or side to side and you will be rewarded with a new looking shiny flawless shine.
Washing the Boxster yourself is good therapy and akin to spending intimate time with a sexy woman...try it...you'll like it
For drying use one of these below, youll be amazed and it saves time too ($12 on Amazon)
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"It broke because it wants to be Upgraded

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2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)