You could try:dpkg --get-selections | grep :i386 | cut -f1 | xargs sudo apt-get --purge remove
It will show you installed 32bit packages. If it looks OK, just add "-y" at the end:
dpkg --get-selections | grep :i386 | cut -f1 | xargs sudo apt-get --purge remove -y
The packages will hopefully be removed.
