If it is on UNIX or similar platform, try the option of developing scripts for scurbbing flat files using a language called AWK with Shell script. This is really fast. And also AWK is pretty simple. Good luck.
This tool is expensive but is tailormade to carry out the complex transforms and handle very large data volumes. Can do 30 gigs in 10-30 mins depending upon the cleaning required.
Ab Initio is like using a sledge hammer to swat a fly if you're just trying to cleanup up a 30 gig file. Many people use ETL tools to manage data quality, just like many people use a hammer instead of a wrench to loosen a bolt. It'll get the job done, but....
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