The CLEAN function is used to removes all nonprintable characters from text. Use CLEAN on text imported from other applications that contains characters that may not print with your operating system. For example, you can use CLEAN to remove some low-level computer code that is frequently at the beginning and end of data files and cannot be printed.
The CLEAN function syntax has the following arguments:
Text Required. Any worksheet information from which you want to remove nonprintable characters.