anyone know what this is on the leafs?

Plant guttation due to root pressure, roots absorb more water than the plant transpires, forcing water and sugars, through the hydathodes, resulting in a crusty residue on the leaves when it dries. It is a normal process, distinct from dew, excessive watering or high humidity. Plant was oversaturated, brought inside, pressure changed, back pressure forces sugars out the tips

I agree with "m0use". It looks like honeydew to me. That is, sugar excretion from sucking insects such as aphids or whiteflies. It fits with the fact that the lady was standing outside. A. californicus is great against spider mites, but it doesn't help much here. What I would do: -Separate the plant. -Thoroughly wipe or spray the undersides of the leaves with lukewarm water + a little insect/potassium soap (especially the undersides). This removes the honeydew and kills many of the bugs directly. -Hang up yellow sticky traps (for whiteflies/aphids) and blue sticky traps if you suspect thrips. - Quickly check what it is: tap the plant – do small white moths fly up? → Whitefly. Are there soft green/black colonies on the tips of the shoots? → Aphids. Silvery speckles + black droppings and slender “sticks”? → Thrips.

if its sticky and sweet its likey honeydew from a pest feeding. Some of the spots look mite like so adding in predatory mites is a good call. Outdoors their are tons of pests. best to treat the soil as well with some BTi or just soap and water.