White Spots on Sick Phalaenopsis

[PlantGrower]

Dear Orchid Fanciers:
Can anyone identify the, "white spot disease," and suggest treatment approaches if any?
I'm a newbee (3 yr.s) to orchids and two of my hybrid Phalaenopsis are in dire straights. It's sad as they both rebloomed nicely in the spring for me.
I have posted pics of the sicker of the two. Sick plants are relocated to a friend's (plantless) apt. to hopefully spare the rest of my collection. I would like to treat these if possible and perhaps do some prevention treatment to the rest of my plants.





Thanks for Help,