I don't want to do rm -rf because next time i try to install with the same home name, it is a big problem.
(We have a naming convention due to which we may have to install same home again as requested by the dev team.
This has happened in the past)
Its already documented, please review:
How To Deinstall/Uninstall Oracle Home In 11gR2 [ID 883743.1] <<11gr2
How To De-install Oracle Home Using runInstaller [ID 1070610.1]
I suggest also review:
When deinstalling 11gR1 ,OUI greyed out the Remove button and getting message - You cannot deinstall at this time. [ID 1374044.1]
For general information can be found at:
Information Center: Install and Configure Database Server/Client Installations [ID 1351051.2]