The birds are chirping, buds are starting to pop up on tree branches, the sun is out, and you've already enjoyed a warm breeze or two: Spring is here. Most renters welcome in the new season by undergoing a top-to-bottom spring cleaning event in their apartment, and after a long winter, we can't say that we blame them. Winter means we spend more time indoors, and we track a lot of outside grime inside (salt and snow and ice from the sidewalk come to mind). Now is the time to…