using OUI in batch mode : multiple installing

Hi, I have to perform an install client compounded of multiple steps.
I want to create a batch that will perform the following operations on oracle clients :
1) Clean the current install
2) Install 10.2.0.1 client (runtime)
3) Install 10.2.0.4 patch

I created 3 response files and call setup on it in my dos batch.
The problem is that I need to perform additional operations between the steps (clean registry, directories).
To be sure that the steps will be finished, I put a wait between the steps (based on average duration).

Is there a better way to perform such install ?

Thanks in advance.

Frédéric