Water is often recommended as a lubricant for clay bars during automotive detailing for several reasons:

1. Safety for Paint Surface: Water is neutral and does not contain any chemicals or additives that could potentially react with the clay bar or the vehicle's paint. This reduces the risk of unintended chemical reactions that could damage the paint.

2. Ease of Application: Water is readily available and easy to apply. It can be sprayed onto the vehicle's surface using a spray bottle or applied using a sponge or cloth, providing a consistent and sufficient layer of lubrication for the clay bar to glide smoothly.

3. Cost-Effectiveness: Compared to specialized clay bar lubricants or detailing sprays, water is economical and does not require additional expense. It is a practical choice for frequent users of clay bars who may prefer a straightforward and affordable lubrication option.

4. Environmental Considerations: Water is environmentally friendly and does not contribute to air pollution or harmful emissions during use. It can be safely disposed of after detailing without adverse environmental impact.

5. Compatibility: Water is universally compatible with clay bars of different grades and types. It ensures that the clay bar's performance in removing contaminants is optimized without compromising the paint surface's integrity.

While specialized clay bar lubricants and detailing sprays offer added benefits such as enhanced lubrication and surface conditioning, water remains a preferred choice for many detailers due to its simplicity, safety, and cost-effectiveness in achieving satisfactory results during clay bar application.