2005 Lexus SC 430 Toxic fumes and odor inside car

Just purchased a 2005 Lexus SC430 certified pre-owned car 2 hours from my Miami home, in Naples FL. Upon delivery, the car had a very heavy, sweet smell in the cabin which I attributed to something they must have sprayed in it during detailing. The car had undergone some 160 point inspection. During the 2 hour drive home, an irritant coming through the a/c vents burned my eyes. The smell and irritant did not improve the next few days, despite my running the a/c on high with the top down to air out the car, so I took it in to Lexus here in Miami and they changed the a/c filter and did an a/c flush. Cost me over $150 and did nothing to resolve the problem which actually seems to be getting worse. The smell is very strong, irritates the eyes, and actually makes me lightheaded. Any ideas? I am taking it back in to Lexus tomorrow.