Если учесть, что Мэгваерс официально заявляет о закупках глины в Японии:

Place of Manufacture (State, Country): Japan
Meguiar’s Inc uses third party manufacturers for some products. Meguiar’s Inc considers the identity of these
manufacturers and the location of these manufacturers, to the extent the location identifies such manufacturer,
confidential and is seeking guidance from the Consumer Product Safety Commission on this issue. In the interim,
Meguiar’s will disclose such information to the Commission upon request, on a confidential basis.

А в Японии её производят на основании патента:
Patent No: US 5,676,714 A
Kodate (45) Date of Patent: Oct. 14, 1997

А в патенте ясно написано:
I claim:
1. A composite for polishing painted surfaces, comprising:
a) a soft plastic body having a contact face adapted to contact a surface to be polished;
abrasive particles embedded in said body at least in proximity to said contact face in an amount effective to polish said surface when said contact face is rubbed against said surface;
c) non-abrasive globular particles embedded in said body at least at said contact face in an amount and size effective to move said abrasive particles toward and away from said contact face when said globular particles are rotated in said contact face, said globular particles at said contact face being adapted to rotate in said contact face when said contact face is rubbed against said surface.
2. The composite of claim 1, in which said body further includes fine fibrous materials dispersed therein.
3. The composite of claim 1, in which said globular particles consist of synthetic resin material.
4. The composite of claim 1, in which said composite has a specific gravity less than 1.
5. The composite of claim 1, in which said globular particles consist of foam material.
6. The composite of claim 1 in which said globular particles have a particle size which is larger than that of said abrasive particles and is substantially 3 mm or less in diameter.
7. The composite of claim 1 in which said body is mainly composed of polyolefin polyol.
8. The composite of claim 1 in which said body is mainly composed of visco-elastic material.
9. The composite of claim 1 in which said abrasive fine particles have a particle size of substantially 3 to 50 μm.
10. A polishing method, comprising the steps of:
a) placing a contact face of a composite in contact with a painted surface to be polished, the composite comprising a soft plastic body containing a dispersion of abrasive particles in an amount effective to polish said surface and non-abrasive globular particles said globular particles being rotatable in said contact face when said contact face is in rubbing contact with a surface to be polished; and
rubbing said composite on said surface to be polished with a substance selected from the group consisting of water or surfactant present on said surface and said contact face, whereby extraneous substances adhering to the surface to be polished are removed.
11. The method of claim 10, in which said substance is applied to said surface to be polished and said composite is pressed against said surface to be polished for rubbing the same.
12. The method of claim 10, in which said substance is applied to at least said contact face of said composite, and said surface to be polished is rubbed with said composite while pressing said composite thereagainst.
13. The method of claim 10, in which said substance is water.
14. The method of claim 10, in which said substance is surfactant.
15. The composite of claim 1, in which said abrasive particles are dispersed in said body adjacent said contact face in the ratio of substantially 700 g of abrasive particles per 150 g of said soft plastic body.
16. The composite of claim 1, in which said abrasive particles are selected from the group consisting of silica sand, calcium carbonate, alumina, and green carborundum.
17. The composite of claim 1, in which the material of said nonabrasive globular particles is chosen from the group consisting of synthetic resin, rubber and foam materials.