Are you sure it wasn't a sankie in cockroach outfit..........
In my previous house, I allowed a friend of mine to wash his clothes there in my washing machine, well he brought some West Philadelphia die hard roaches with him and it took years to get rid of them, exterminator and all......After the extermanator fed them for two years or so at $25 a month and realized I was feed up with her services, she produced, or came up with a product that was in a tube, simuliar to what toothpaste comes in, and it got rid of them right away. It was expensive, but worth it. Prior to getting rid of them, I had one crawl out of my suit, while on a dinner date, which my lovely date called my attention to, grant you that was a last date.........Still pi$$ed with everybody..... All i'm trying to say is if they become a problem, get a professional and a guarantee, if possible, and don't get gouged or ripped off like I did..........