Clear out of datarange ranges. facebook.com/groups/googleappsscript

Code.gs

 // Any sheets iterator here ----- START
    clearOutOfDataRange_(sheet);
 // Any sheets iterator here ----- END

function clearOutOfDataRange_(sheet){
  var lR = sheet.getLastRow();
  var lC = sheet.getLastColumn();
  var mR = sheet.getMaxRows();
  var mC = sheet.getMaxColumns();
  if(mR > lR)
    sheet.getRange(lR + 1, 1, mR - lR + 1, mC).setBackground('#FFF');
  if(mC > lC)
    sheet.getRange(1, mC - lC + 1, mR, mC - lC + 1).setBackground('#FFF');
}