Phal with "translucent" leaves

[Shikitita]

Hi!

My name is Tamara and I am new in the forum. I have been reading some of your articles as I have two orchids and there's always been some information I've needed (at the moment they're in the bedroom, cooler than the living room and trying to put them in a dormant period so they can recover from a "bad" year).

Unfortunately, now it's not just that but I also need help.

Last Sunday we bought a new orchid in a well-known shop here in the UK, without realizing that the leaves weren't as healthy as they should have been.

When cleaning it after getting home I noticed there was a mini spider going around, and had left some small threads of cobwebs around. I think I killed it, cleaned the orchid and everything was fine. But a couple of days ago I found a few more threads, again, which made me think that probably I hadn't killed it.

After reading today this thread (Some glue under phalaenopsis leaves), I went to have a look and found more cobweb threads again. The description of the leaves is the exact same one, as they have like small patches of glue on their back and also dark spots all over the edges. They are loosing their colour as well, which is really worrying me...

I probably bought it sick, but I don't know what to do as it's a really nice orchid, in bloom (despite bringing it home walking for 20 minutes in temperatures of 5º C or less), and doing better than the other two orchids I have.

What would you suggest I do that doesn't involve repotting or thowing the orchid away?

I've attached a couple of pictures so you can have an idea of exactly what's going on.

Thanks for your help!