How to completely deinstall Oracle AS????

I am stuck. Using linux.
I have tried to run all the universal installers I can find. and I have manually removed the OracleAS dirs. However, when I start up the installer for OracleAS 10.1.3.1, it still shows that some instance of oracleas1 is lingering around. i have grepped every directory I can think of to try to find where this is coming from, but I can't find it.
Please, how can I manually deinstall all traces of oracleAS from my linux system? Where are the secret config files?

Yea, I went through the oraInventory dir and looked for anything like that, but I couldn't find it. I don't want to nuke them completely because I have an existing Oracle11g DB server installed that is in that inventory and I don't want to mess that up.
I looked through the ContentsXML dir and deleted everything except the OracleDB, but still Oracleas will not install. It gives me an error that it is already installed in the oracle_home chosen. But there is nothing physically there...

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    *1. Any idea to remove Grid infraestructure normally?*
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    *1. Any idea to remove Grid infraestructure normally?*
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