In my experience, Ales are the bigger problem in terms of sanitation concerns, as the colder lager beers don't seem to be at a temperature that promotes a lot of bacterial issues and one typically pitches pretty large amounts of lager yeast. Even so, applying a good cleaner, then a thorough rinse and then a sanitizer should be standard protocol for all home brewers. Now with my sours, I want certain bugs in there...but that's another story.