Washboarding is generally thought to be a cleaning behavior.  Gerry  Loper, 
Tucson USDA lab, retired, told me that AFB in rock caves in AZ tended to  
scrub the rock face before building comb.  Pettis and a collegue posted a  
short note stating that washboarding was both age related AND increased from  
glass to wood to slate.
 
Jerry
 
 



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