The delete button in Poser only deletes the file you have selected, and the accompanying rsr and/or png.

You have to delete the textures and obj files seperately, and as aRtBee mentioned, they can be referenced by other items, or named in such a way as to be hard to make sure what to delete.

When I find I want to delete a file and the obj and texture files that it uses, I use P3d0 explorer. Simply by selecting a cr2 or pp2 it shows where any other files it references are, and what their names are, and using its interface makes it real easy to delete the uneeded files.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.