Using a wash mitt or clay mitt with soap as a lubricant can be effective, but there are some things to keep in mind:

1. Lubrication: Soap can provide some lubrication, but it may not be as slick as dedicated clay lubes. A clay-specific lubricant is designed to minimize friction and enhance the clay's effectiveness.

2. Contaminants: If you're using soap, make sure it's a gentle formula. Harsh detergents can strip wax or sealants from your paint.

3. Technique: Use a light touch and keep the surface wet. Rinse the mitt frequently to remove trapped contaminants.

4. Finishing: After claying, follow up with a thorough wash and a final rinse to ensure no soap residue remains on the surface.

If you're looking for convenience, a clay mitt with its own lubricating solution might be a good alternative. 

Using a wash mitt or clay mitt with soap as a lubricant can be effective, but there are some things to keep in mind:

Lubrication: Soap can provide some lubrication, but it may not be as slick as dedicated clay lubes. A clay-specific lubricant is designed to minimize friction and enhance the clay's effectiveness.

Contaminants: If you're using soap, make sure it's a gentle formula. Harsh detergents can strip wax or sealants from your paint.

Technique: Use a light touch and keep the surface wet. Rinse the mitt frequently to remove trapped contaminants.

Finishing: After claying, follow up with a thorough wash and a final rinse to ensure no soap residue remains on the surface.

If you're looking for convenience, a clay mitt with its own lubricating solution might be a good alternative.