In a small bowl combine the water, vinegar, and essential oils.
Pour the vinegar mixture over the washcloths, pressing the washcloths down into the liquid. The washcloths should be wet. Depending on the size of your washcloths, you may need to add more vinegar/water as needed.
Close the lid on the jar.
Remove the washcloths from the jar as needed. Wash the dirty cloths in the washer, and repeat the process. When you introduce water into a product without a preservative you always run the risk of introducing bacteria, so use water-based products quickly.