Looks to me as if your catt has a case of mealie bugs. I've never had them on my orchids but have had them on other plants.
If I'm correct then you will have to keep applying the alcohol at first signs of new white areas or maybe weekly or daily before anything new appears to be sure you wipe them out. You might want to repot to make sure your medium is not infected. I'm sure more experienced growers will be able to offer more.