Manipulating the "\" char on a string

I need to change (or erase) the "\" from a string, it has been impossible because I have tried everything to locate it into the string but it's impossible to detect it, here's my code:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class xmlwriter extends HttpServlet
public void service(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
ServletOutputStream salida = res.getOutputStream();
res.setContentType("text/HTML");
String quitar = "$#092";
String cadena = req.getParameter("cadena");
String result = cadena.replaceAll("n<","\r<");
String result1 = result.replaceAll(quitar, "a");
//System.out.println(result);
File f1 = new File ("c:/salida.xml");
FileWriter out = new FileWriter(f1);
f1.createNewFile();
out.write(result1);
out.close();
salida.println("Finalizado");
This code should change every "\" for an "a" but, nothing happens, I'm passing the ascii code of the "\" char, I have tried EVERYTHING but nothing happens, anyone can help me??

Ok, I have solved how to change the "\", now how can I remove it from the string??, is there any cadena.removeAll("\\\\")?

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