I am a new Orchid Lover and repotted my 8 orchids (3 were keiki from last year) and not sure if they are infected with mealybugs but the leaves are getting yellow, plants look unhealthy and some had a white fuzz below the leaves. The Plant Nurseries won't let me bring them in because of Covid. I removed all plants from medium & pots, cleaned & sprayed leaves & roots with alcohol and repotted a month ago but they are still sick. I repeated the process today and wonder if anyone can help me save my orchids. Thanks in advance.