1. Cost Savings: Washing your car at home can save money compared to using commercial car wash services. While there may be an initial investment in equipment and supplies, the long-term savings can be significant.

2. Convenience: Cleaning your car at home allows you to do it at your own convenience, without having to drive to a car wash or wait in line.

3. Customization: You can tailor the cleaning process to suit your car's specific needs. For example, if you have delicate paint or sensitive areas, you can use gentle cleaning methods to avoid damage.

4. Thoroughness: When cleaning your car at home, you have the freedom to pay attention to every detail, ensuring a thorough cleaning both inside and out.

5. Environmental Considerations: Some commercial car washes use a lot of water and harsh chemicals, which can be harmful to the environment. Washing your car at home allows you to use eco-friendly cleaning products and control water usage more efficiently.

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Regarding water purity for washing your car, the total dissolved solids (TDS) or parts per million (ppm) in the water is a crucial factor. TDS measures the concentration of dissolved minerals and salts in water, including calcium, magnesium, and sodium. Lower TDS/ppm values indicate purer water.

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For washing cars, it's generally recommended to use water with a TDS/ppm level below 100-200 ppm to prevent water spotting and ensure a streak-free finish. However, in reality, tap water from municipal sources typically has TDS/ppm levels ranging from 100-500 ppm, depending on various factors such as location and water treatment processes.

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To achieve lower TDS/ppm levels suitable for car washing, you might need to use filtered water or a deionization system. Deionized water systems can reduce TDS/ppm levels to near-zero, providing water that's ideal for car washing as it won't leave behind mineral deposits or spots.