Replacing ¿ special character on Linux

We are on Linux Suse. One of our application has this string XXX � YYY in the data file. I think it was entered through some spanish keyboard. But we want to replace this character with a space before we send the file to other applications.

I opened the file using Vi Editor .I thought first of all i need to copy this character and use the command
sed 's/�/ /g' to replace the character with a space. But i couldn't even copy this character.

Please advice.

Thanks,