You don't need an outside tap to wash your car. All you really need is a bucket, some soap, and a hose. Start by filling the bucket with water. Add in some soap or detergent (like dishwashing liquid) and mix it together until it's sudsy. Find a spot in your driveway or yard that has good drainage and lay out all of your supplies: the bucket of soapy water, a sponge or cloth for scrubbing, another clean bucket full of plain water for rinsing, and the hose. Get into position near the door to start washing your car – this will be wetter than usual since you won't have access to running water! Use the soapy mixture from the first bucket to scrub down each panel of your car thoroughly using circular motions with either a sponge or cloth before dipping it back into the soapy mixture again if necessary. Then use plain rinse water from the second bucket to remove any leftover soap residue on each panel before finishing off with fresh clear water from the hose. Allow your freshly washed vehicle plenty of time to dry naturally in order for its finish not become tarnished due to excess moisture left behind after cleaning!