The development of clay bars for automotive detailing primarily revolves around enhancing their effectiveness and usability. Here are some key aspects considered in their development:

Material Composition: Clay bars are typically made from synthetic or natural clays combined with lubricants and other additives. The composition affects the clay's ability to pick up contaminants without damaging the paint.

Effectiveness: Manufacturers focus on improving the clay bar's ability to safely and efficiently remove contaminants from vehicle surfaces. This includes optimizing the clay's adhesive properties to grip contaminants effectively.

Safety: Clay bars are developed to be safe for use on automotive paint surfaces. This involves testing to ensure they do not scratch or mar the paint when used correctly with adequate lubrication.

Ease of Use: Clay bars should be easy for detailers of varying skill levels to use. Development efforts may include making the clay more pliable and easier to manipulate, reducing the effort required during the detailing process.

Durability: Clay bars need to maintain their effectiveness over multiple uses. Manufacturers work on ensuring that the clay remains intact and functional for an extended period without crumbling or becoming ineffective.

Environmental Considerations: There is also a focus on making clay bars environmentally friendly, both in terms of their composition and their disposal after use.

Overall, the rule of clay bar development is to create a product that effectively removes contaminants from vehicle surfaces while being safe, easy to use, durable, and environmentally responsible.