So I got this Schefflera Arboricola about a year ago, and I've noticed these white spots on some of the leaves. What is it and how do I get rid of it? Thanks!!

Take some rubbing alcohol on a corner of a rag and wipe down the leaves very gently. Get both sides of the leaves and get all of them.

Hi,
are you misting or spraying?

Sally raises an important question. If you are misting with hard water, then the minerals in the water are collecting on the leaves. If the white residue was there when you got it, then it probably pesticidal residue from greenhouse overhead spraying.

It's harmless but should wipe away with soapy water and a little elbow grease. There are also commercial leaf cleaning products that rinse away mineral deposits very easily and leave a shiny finish. One such product is called BrandX.