Well, I clean the leaves every week, when watering. It's a very happy moment and i enjoy it so much. It's my moment of relax. since my plants are in the living room I don't want them to be a dirty aspect. By now I have only 75 orch., then it's is still possible for me.But it takes about 3 h or more, this depends on my hurry.
Everything get lots of dust in my house.
I clean with water and paper towel, removing dust and the dry sheaths of the pseudobulbs. They look great and very healthy so.
@ amey, isn't orange juice a bit acid for cleaning leaves? interesting your recipe, and as I saw before, your orch. look fantasticly healthy