Blix said that Saddam had nothing after 1991.

The chronology of the U.N. inspection process shows a continuous pattern of deception, discovery, and destruction of previously-unknown weapons and facilities through the mid-1990s. Blix is, to put it as generously as possible, inaccurate. It goes without saying that he has invested a good portion of his reputation in the premise that Iraq was clean when he was inspecting it (or he would have found something, right?)

Some excerpts from my previous link:

Feb 1992 Iraq refuses to comply with an UNSCOM/IAEA decision to destroy certain facilities used in proscribed programs and related items. The Security Council condemns Iraq’s failure to comply with its obligations. Iraq finally agrees to destruction of those facilities and items.

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Jul 1992 UNSCOM begins destroying large quantities of Iraq's chemical weapons and their related production facilities.

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June 1994 UNSCOM completes the destruction of large quantities of chemical warfare agents and precursors and their production equipment.

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1 Jul 1995 The culmination of an UNSCOM investigation forces Iraq to admit for the first time the existence of an offensive biological weapons program. However, Iraq denies that it has weaponized this capability.

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8 Aug 1995 General Hussein Kamel, Minister of Industry and Minerals and formerly Director of Iraq's Military Industrialization Corporation with responsibility for all of Iraq's weapons programs, leaves Iraq for Jordan. Iraq says that Hussein Kamel had hidden important information on the prohibited weapons programs from UNSCOM and the IAEA. Iraq withdraws its third biological FFCD and admits a far more extensive prohibited biological weapons program than previously admitted, including weaponization. Iraq also admits greater progress in its efforts to indigenously produce long-range missiles than it had previously declared. Iraq provides UNSCOM and the IAEA with large amounts of documentation related to its prohibited weapons programs which subsequently leads to further Iraqi disclosures concerning its production of the nerve agent VX and its development of a nuclear weapon. Iraq also informs UNSCOM that the deadline to halt its cooperation is withdrawn.

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Nov 1995 The government of Jordan intercepts a large shipment of high-grade missile components destined for Iraq. Iraq denies that it had sought to purchase these components, while acknowledging that some of them were in Iraq. An UNSCOM investigation concludes that Iraqi authorities and missile facilities have been involved in acquiring sophisticated guidance and control components for proscribed missiles. UNSCOM retrieves additional missile components, apparently disposed of by the Iraqis involved in the covert acquisition, from the Tigris River.

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May-Jun 1996 UNSCOM supervises the destruction of Al-Hakam, Iraq's main facility for producing biological warfare agents.

I omitted many incidents of non-cooperation and sheer bad faith. I'm not sure how I can make it any clearer.