I PX'd recently from MEL to HKG. Was on the a/c during the cabin cleaning. And I'm being very flattering with the word cleaning.
I suggest everyone brings sanitary wipes for their tray tables. The cloths used for 'wiping' are the same ones the cleaners used for the toilets.
I only hope that the cloths where used for the mirrors...I assume this type of 'cleaning' is for pretty much any airline right??