Hi folks,
Can anyone tell me what is causing this on my Dend. It is on my patio and there are actually two different plants in one pot. The leaves of the one on the left are covered with this white stuff. I wipe it off and the paper towel is brown. I am thinking of buying some hydrogen peroxide and alcohol to spray (perox) and then wipe (alch). I really want to save this orchid as it was a present. It gets light where it is and it blooms consistently. There are new leaves coming out, but I am afraid these might get this disease also.

Any suggestions would be appreciated.
Thanks

What do you think?