When it comes to using clay during car washing versus after, here’s a quick rundown of the pros and cons of each approach:

Clay While Washing

Pros:

• Time-Saving: Integrating claying into your wash routine can make the process more efficient, especially if you’re doing a thorough clean.
• Immediate Contaminant Removal: You can remove contaminants as you wash, leaving the surface ready for waxing or sealing afterward.

Cons:

• Potential for Damage: If you don't rinse the surface properly before using the clay, you might rub dirt or grit into the paint, which can cause scratches.
• Less Effective: The foam and soap may not provide as much lubrication as a dedicated clay lubricant, which can affect the performance of the clay.

Clay After Washing

Pros:

• Cleaner Surface: Washing first ensures that the bulk of dirt and grime is removed, minimizing the risk of scratching the paint when claying.
• Better Lubrication: Using a dedicated clay lubricant after washing provides a smoother experience and helps the clay glide more easily over the surface.
• More Effective Detailing: This method allows you to fully assess the condition of your paint before proceeding with polishing or waxing.

Cons:

• Time-Consuming: It adds an extra step to your detailing process, which can be a drawback if you’re in a hurry.

Recommendation

For the best results, it’s generally recommended to wash your car first and then use the clay bar afterward. This approach reduces the risk of scratches and allows for a more thorough decontamination. It’s an extra step, but it pays off in the long run for maintaining the paint's condition and finish.