catasetum with sticky leaves

[Roberta]

I would suspect spider mites (which loooovvve Catasetum-type leaves) Spray with rubbing alcohol and them soapy water (dish soap). And repeat at intervals of a few days. If you spray with anything stronger, read the label to make sure that the product works with mites (which are not insects, but arachnids)

[Oranagra]

Thanks.
I can't spot anything with a microscope, and also i'm not sure if spider mites leave sticky residue?
i sprayed the leaves and crevasses with 70% rubbing alcohol, i hope it'll take care of whatever's causing it, and won't harm the plant too much.
Interestingly, i have a Lycaste sitting right next to it, and it seems unaffected, although their leaves looks very similarly to me (but i'm not a spider mite).