What kind of Ajax was it. They make a liquid dish soap. I'd put the pants in the washer and wash them like usual. For the car rent a carpet cleaner and use that, skip the detergent.
If it's the powder kind used to clean sinks or bathtubs. Just brush it off of you and vacuum your car, I think it's activated by water so you don't really have to worry about it bleaching any thing. If it gets wet just follow the directions for the liquid dish soap.
If it's the powder kind used to clean sinks or bathtubs. Just brush it off of you and vacuum your car, I think it's activated by water so you don't really have to worry about it bleaching any thing. If it gets wet just follow the directions for the liquid dish soap.