The stuff literally looks like white paint drops that fell on the plant. it’s all over the plant and it’s not paint.
What is it and what can I do to get rid of it?
Is it contagious?
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It sure looks like scale to me ; there are various kinds, my problem scale is smooth and dark. I remove mine with a finger nail but you have a lot. A dilute oil spray should work but avoid getting much oil on leaves. Oil sprays are usually used when the plant is dormant , but I have had to use oil ,sparingly , on growing camellias. You can buy "dormant oil" in a garden shop or, read the instructions in the garden shop and get much cheaper baby oil or mineral oil ( they all come out of the same refinery unit) . "Dormant oil" has a tiny bit of surfactant , a.k.a. detergent. So .I add a drop or 2 of liquid detergent to a gallon of water/oil mix.