HELP! Mealy bugs AND scale

[puddin]

Got a looking at one of my orchids today, and one of my catts. have both scale and mealy bugs! Where did those come from? Anyway, I took a cotton swab with alcohol on it and wiped almost the whole plant off. What next? The books I have say use insecticide. What do you usuelly do? The plant is well away from all other plants. When it had the pests on it, the catt. was already a little apart from the other plants that I have, and I found no other problems on other plants. Though I know that it can be very short term. So, what do I need to do next?