Scale are pretty simple to get rid of. Buy some systemic insecticide (Amazon has a generic form of Bayer Advance Tree and Shrub called Compare 'N Save Systemic Tree and Shrub Drench that is not pricey). While you are waiting for it to arrive, mix:

3 tablespoons baby shampoo

1/4 cup rubbing alcohol

to 1 gallon of water.

Spray it all over the plant, making sure to get all stems, under all leaves, etc. LEAVE THE PLANT IN A SHADY SPOT UNTIL IT DRIES COMPLETELY. In a couple of days, if the plant has residue on it, you can rinse it off under warm water.

When your systemic arrives, shake it very well. Add 4-5 tablespoons to a gallon of warm water. Shake well. Water into plant thoroughly. It may take a week or two forthe systemic to work, so you may have to dothe first treatment (the one with baby shampoo and alcohol) again.

Re-drench your plant every 3 months.