This looks like boisduval scale. It is very difficult to get rid of. Since your growing area seems to be attached to your house, you don't want a fogger or anything like that. Neem oil may work but it will take quite a few applications. I would unpot any plant that is badly affected and treat it bare root so you can cover the entire plant. These guys like to hide on roots. If it's really bad, scrub it with warm, soapy water before spraying. Sometimes you have to be brutal. If the plant looks like it won't make it get rid of it. Best of luck with this and please keep us informed.