Hey...what if I remove the headlights & shoot them with a blow dryer? This might work. We'll see.
blow drying it is not a good idea. more heat to this thing will make the it worst and turn the condensation to water probably. when you took it to a detail shop, the guy steam washed ur engine bay, the heated pressure does that to ur headlight. you cant blame the detail shop cz its not their fault that somethings wrong with ur headlight. this happens to some cars. wut you can do is take off the bulbs off the headlight unit and have ur car out for a fresh air. DO NOT have ur headlights on when doing this. trying it out morning and night. next day check it out. it probably will be gone. a few hours/days later ull find out if it really worked or not. if it didnt work, usually when you turn on ur headlight ull see the fogging thing again. if this dont work, then you have to open it, let it dry, clean it, and then reseal it with good amount of pressure. reasons why headlights have condensation problem is usually if the car has been hit before, or headlight damaged slightly, if you have opened the headlight unit before and havent sealed it well with good pressure, or just bad fabricated headlight. there are a lot of bad fabricated celica headlights out there, and if you have a type of warranty, you can get them to change it for u. good luck and let us know wut happens