There are a few things you can do to clean yourself in your car during the summertime. First, make sure you have a bucket and some water. Next, wet your hands and put them on the inside of your car windows. Then, use the bucket to pour water onto your hands and start scrubbing at the dirt and grime that has built up on your windows. Be careful not to get any water on the inside of your car seats or dashboard. Finally, use a cloth or paper towel to dry off all of you.