It's almost certainly not just honeydew and IS a problem. Mealies (the mealy bug) cause this problem and it doesn't have to be an infestation to cause it either so you may not even see the mealies. But the sap is a dead giveaway! I treated a phal of mine at home by using a cottonball soaked with rubbing alchohol and wiped down the leaves, making sure to remove all of the sap. If you've caught it early enough this should work just fine. Keep a close eye on it as you may need to treat it a few times. This is exactly what I did with my phal and it is doing really well now. And no, the alcohol does not hurt the plant. Good luck
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