Either way, Kipa is reporting that Chief Rabbi Rav Dovid Lau has published a letter in which he lays out what should be done with these cars. Rav Lau paskens that burial of car parts is only to be used as a last resort. After sending a special team to analyze the cars and figure out how to handle them, there is a difference between upholstery that absorbed blood and metal/aluminum body of the car that did not absorb blood but has remains on it. A special team should be recruited to gather any remaining remains and efforts should be made to not require burial of metal car parts.

metal surfaces should be scraped of human remains and then once clean the metal should be sent to the scrapyard. The metal can be recycled and used for other purposes.