title: Notepad++ how to remove non-UTF-8 characters
body: <p>I've a problem: I'm trying to upload a big csv to google datastudio, it tells me "error: non utf-8 characters found ". 
  I'd like to know if is there a way to remove such characters using notepad++ or, at least, how to search for them for replacing by hand.</p>
  
  <p>I tryed with <strong>encoding > convert to utf-8</strong> but doesn't work</p>
  
  <p>EDIT: this is a link to my csv: <a href="https://www.dropbox.com/s/h6vki7lysk4ui2a/Cartel3_a_anonimizzata.csv?dl=0" rel="nofollow noreferrer">CSV</a>
  this is the error I got from google: </p>
  
  <p><a href="https://i.stack.imgur.com/QXi5a.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QXi5a.png" alt="enter image description here"></a></p>
  
  <p>(I also tryed deleting the line but same error occurs, few lines earlier or few line later)</p>