What was she thinking? Car Washes are still affordable..?

So by now, we all know that Casey Anthony is a lunatic and a liar. Assuming (as she has not been proven guilty yet) that she murdered Caylee, it appears she went to lengths to hide what happened. She stuffed her in bags, dumped her in the woods, made up friends and a story about what happened to caylee, so WHY on earth would this crafty lunatic forget to CLEAN the car ????? This makes no sense to me. Why would someone triple bag her daughter, dispose of her in a wooded swampy area, and not clean the car ????? she must have smelled the odor ... so why did she not clean it????? This boggles me.....