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The newly saved CSV file will now have a UTF-8 encoding, with all the special characters converted properly. You can then upload the file to Lead Liaison and it will preserve the special characters.
Special characters in Forms
If you find that special characters (e.g. öüó?ú?áéí) submitted into a subscription form,unsubscribe form, etc. do not show up in the application, the problem is most likely due to a difference in character encoding between the web page your form is on and Lead Liaison.
The application uses a UTF-8 character encoding by default, and you need to make sure that the page your form is on is also UTF-8 encoded. You might need to add the following tag to the <head> section of your HTML page:
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />