I’ve had my beloved monstera for about a year now, I raised him from a single cutting and now he’s grown 7 new leaves. I noticed mealybugs on him last week so I took him outside, hosed the bugs off and sprayed the leaves with soap & water to kill any remaining bugs. Now the leaves are turning black, even the brand new one that just opened last week. Google said the black spots were most likely root rot, so I took him out of his pot, sprayed all the soil off the roots but didn’t find any rot, in fact his roots look pretty healthy. I repotted him in a new pot with fresh soil but the black is spreading. What can I do to save him???