Top 10 Unusual Car-Washing Tips Published on June 22, 2018 in Top 10 by The Car Guide Photo: YouTube 8. Vinegar for washing car seatsMix two cups of white vinegar with one cup of tepid water and two tablespoons of dish soap. Scrub all the stains on your car seats using a sponge and rinse with a wet cloth. It’s quick and surprisingly effective! Start by doing a little test on a less visible section.