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It sounds like you are starting the
Clean Installer and then looking at the packages in your LotCatalog. That's too late. By the time that a package is in the LotCatalog folder (a.k.a. Lot Bin), all of the CC has already been placed in your Downloads folder.
If you want to clean a lot, you need to open the Sims2Pack file with the Clean Installer, which you normally do by double clicking on the Sims2Pack file.
If you are trying to clean a lot so that you can share it, the first step is to package the lot in-game. That will create a Sims2Pack file in your PackagedLots folder. Then, double click on the Sims2Pack to run the
Clean Installer and see everything that the game packaged with the lot.