My experience with Neem oil is that you have to be careful applying it in late spring/summer, especially with varieties like juniper. My preference is to switch to a light horticultural oil for early spring applications and I usually only do it once. Thereafter, I use insecticidal soap and usually only do that once in the spring and another one in late summer. I was able to get scale on a plant that came into my collection under control in a year or so using that combination. Isolate the plant if you see scale so that they won't infest other plants near it.
This may be too finicky for you but I hand picked the scale off using tweezers and put them into a container filled with alcohol - no, not the good stuff
This may be too finicky for you but I hand picked the scale off using tweezers and put them into a container filled with alcohol - no, not the good stuff