Mix the dish washing and laundry soap in a large bucket until the powder is completely dissolved. Using hot water will make it dissolve completely. Use more water if you think the solution is soapier than you need. Use a little less water if your really dirty car needs a good scrubbing.Can you use vinegar to clean your car?
Take one part of white vinegar with three parts of water. For instance, you can also mix one cup of vinegar with three cups of water. You can use this vinegar solution to clean car windows. Take an empty bottle and put vinegar and water in it.