Coffee vs. snails

[Coconutmuffn]

I recently acquired a new vanda (Robert's Delight 'Black') and it came with some hitchhiking bush snails. For the last 3 days I have been spraying it down with undiluted coffee dregs in the pm (before bed) and then hosing it or soaking it with water in the am as per usual watering routine. I haven't seen any snails since 12 hrs after the first coffee treatment.

Therefore, I was wondering how long those who have been successful with this method have treated and if this sounds like a good or bad routine for the welfare of the plant. This is a substantially sized plant, but I can provide pics if this would help determine what the plant can safely tolerate. Should I bump back to every other day or more on the coffee treatment?

I have placed out a potato this evening to see who shows up. Good news is that so far, I have 1 out of 2 untouched new nubbin roots!! Thank you for any help!!