Despite their good intentions and best efforts, Americans doing their spring cleaning might make the home look or smell better on the surface, but vacuuming and cleaning machines only remove some of the dirt, dust and particulates that cause allergic reactions.  In a recent national poll commissioned by Stanley Steemer, the nation’s largest deep cleaning service, nearly half of respondents predicted spending less than four hours total on this year’s spring cleaning.  But only 19 percent reported having ever used a professional for cleaning.