Phalaenopsis developed brown spots all over

[LittleHelena]

I've got a problem with one of my phalaenopsis I am not able to diagnose or treat myself. Recently, it developed brown and smaller black spots under its leaves, dark brown blotches on its stem and brown blotches filled with tiny brown spots on its blossoms .
The flower doesn't seem to be withering yet, but the disease seems to be spreading on the other stem as well. Just for safety, I lifted it away from the other phalaenopsis.
Could you please help me? I've searched the Internet and books, but found nothing like it.
Here are links to the pictures: (Too big to post here)
PICTURE 1
PICTURE 2
PICTURE 3
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PICTURE 6

[King_of_orchid_growing:)]

The pics are blurry, but from I can see. I'm guessing that the problem may be temperature related. Can you post your growing conditions (ie temperature, humidity, lighting, air circulation)?

If you feel it is a spreading disease (I don't think it is, but again I'm not certain), you can cut the flower spike off (as low as you can without harming the plant) with a sterilzed razor blade or a pair of scissors/a knife put over an open flame for more than a minute (be careful don't hurt yourself or the plant, I've done both by accident a few times, not fun).

Then you can either use hydrogen peroxide or a little bit of household bleach diluted in water.

For the bleach, you really don't need to (probably shouldn't either) use a lot of it mixed in solution of water. As an example, a couple of spoonfuls of bleach is good enough to mix with a cup of water. Ideally the water should be RO/DI, but if you're using tap, and it contains chlorine, you're essentially adding more chlorine to the bleach (it'll make more bubbles). You can dip the entire plant in a bucket full of the solution for about 5 or so minutes. Or if you feel uncomfortable with putting the whole plant in the bleach solution, you can just dip the part of the plant with the leaves and not disinfect the roots. Leave the bleach on until it dries, then wash off with clean water.

The hydrogen peroxide you can just pour into a bucket and put the entire plant in and leave it in there for about 20 or so minutes. Nothing bad will happen to your plant. After that, there's no need to rinse, just keep growing it properly.

Worse case scenario, if a disease is very persistent you may have to get a fungicide or bactericide. I don't know what's available in Estonia.

[LittleHelena]

Well, my phalaenopsis are home-grown indoor orchids. The temperature is somewhere around 20 centigrades, I try to spary them twice a week(at the moment more often, since one flower has mites), I don't let direct sun shine on them, but they are on the windowsill. Wouldn't know about air circulation. When the window is open, then there should be enough. Window is in the other room.
I doubt it is temperature related, though, for the other phalaenopsis are fine. No blotches.

I'll give the bleach a try. Thanks for the help. I hope I can save my poor.