Answer by  
                                                                                          GilFinn (2065)
                                                            
                          
                          
                                                          If it smells, it's most likely mildew caused by excessive moisture. You need to kill the mildew spores with a solution of 2 tblsp ammonia, 1 cup warm water.  1st, vacuum area thoroughly. Blot the area, and dry/rub with white towel.  Thoroughly dry the area with a heater or fan.