Most motels like us use a "Rainbow Air" ozone machine, close the place tight and leave it on all day and don't let anyone be in there while it's on and allow it to ventilate for about 30 mins before going in again. Concentrated O3 is not healthy. Apparently the O3 molecules eat "smell" molecules, or something like that. If you can't find one, visit a few motels in your area and you might be able to borrow or "hire" one. Last one we bought was about $1200. Great to remove smoker smells, Lynx Jungle Venom or similar, and the leftover smell of exotic foods and spices. But overdone lingering long term Eastern type spices require a whole clean approach of carpet, walls, ceiling, soft furnishings etc like you're doing. With exotic guests going into our apartments or accommodation with cooking facilities, we advise that using spices which leave a smell which can't be removed with a normal clean will be regarded as extra cleaning and will attract massive extra cleaning costs on their credit card.
Good luck
cheers
crest133