My practice is to wash out the extractor and uncapping tray if they are going
to sit idle for more than a day or so.
 
I have found that in the humid summer Maryland climate, honey will absorb
moisture and ferment surprisingly quickly if it is left with a lot of open
surface.   I also have come to fetch my not-yet-cleaned uncapping tray and
found in the honey a candied mouse.  That taught me to clean up after each
day's extracting.
 
W. G. Miller
Gaithersburg, MD