Infected palm tree?

in Plants
Hi all,
New gardener here!
One of my palm trees I recently bought has some kind of white fungus type substance (was present when bought).
Anyone know how to treat this? I physically removed some of it but not sure if that is enough going forward.
Regards
Matt

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Posts
Hard to tell from your photo, you need to slightly crop it and it will reload right way round but is it fungus or spots from being watered with hard water?
Hopefully this photo is more clear
I'm sure someone can advise about it or have a look at a website that sells palms as they often cover health problems. One site i just looked mentioned mealy bugs and asked whether they moved.