To remove obsolete GRID HOME, after an upgrade is completed, proceed as below (cf MOS 2537389.1):
As root (on both nodes)
cd /u01/app chown -R grid:oinstall 126.96.36.199 chmod -R 775 188.8.131.52
then, as grid, from the node 1, then 2 if the cleanup did not occur on both nodes
sudo su - grid export ORACLE_HOME=/u01/app/184.108.40.206/grid $ORACLE_HOME/deinstall/deinstall -checkonly
Check than the directory /u01/app/220.127.116.11.0 is now empty on both nodes.