I just added more comments above. Wiping with alcojol might help, but they can be in the media and in nooks and crannies where wiping won't get too. I recommend a spray that will run into nooks and crannies and into the media. I don't know what you have access to but I often use Malathion (a contact spray) to kill everything on contact and then follow thru with Merit (an imidacloprid base) as a systemic to deal with eggs that will be hatching. In my opinion, scale is the hardest pest to get rid of and 6 months later, when I am sure it is gone, it can show up out of the blue. Multiple treatments will also be necessary.
---------- Post added at 12:32 PM ---------- Previous post was at 12:11 PM ----------
I'll also add, the casing on new growths can turn black or brown and that is normal. You can very carefully peel it back, maybe by slitting it first to avoid damaging the growth and make it easier to come away. Remove any dry casing and bracts as it is a good place for scale to hide.
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