You probably have a bacterial or fungal infection epidemic going on in that enclosed space. You may safely spray the entire greenhouse - plants, benches, floor, structure - with something as mundane as diluted liquid bleach. Here, the standard bleach is about 5% sodium hypochlorite and an ounce per gallon works fine.
If you can get Physan there, or a swimming pool disinfectant containing quaternary ammonium salts, they’re good too.
Being topical treatments, none of those will cure infected plants, but it will reduce the spread.
Copper compounds can systemically kill both fungi and bacteria, but it’s supposed to be toxic to dendrobiums, so be wary.
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