Everything related to you as a user should be in /home/user (and any settings you add to a program, like downloading saved remotes), remotes that came with the might be there, in /opt or elsewhere but if they came with the app then they should be uninstalled together with it as well. Note that I don't know how Irreco works, so I included both possibilities. Running dpkg --contents on the irreco package should show whether they came with it or not, or you might know whether you downloaded them or not.