How often are airliners washed?!

Date:         15 Apr 97 03:22:40 
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This might seem an odd question, but I guess the cleaner an aircraft
is externally, the faster it flies?

How often are airliners cleaned externally? I recently saw a BWIA
L1011 at Manchester (UK) that was absolutely filthy. It certainly
couldn't have inspired any confidence in the passengers :-)


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