Dubias escaping

[pdomensis]

So I've got a colony of dubias in a large rubbermaid tote and the little buggers are starting to climb the sides and get out. It looks like there's some mildew growing along the walls that they are climbing. Has anyone got any experience with this? Will a regular rubdown of the walls keep it clean enough for them to not crawl up? Or is there maybe a more secure way to keep them from getting under the lid? Thanks!