How to distinguish the quality of clay bar?

How to distinguish the quality of clay bar?

Firstly, the stronger the stickiness, the better the quality of  clay bar. Take a piece of  clay bar and pull it hard. If it is prone to breakage, the quality may not be as good. The more wire drawn, the stronger the stickiness and the better the quality.

Secondly, place the  clay bar in warm water. If there is discoloration or residue, it indicates poor quality. Conversely, good quality.

Thirdly, spray water on the car and wipe the car body with clay bar. If mud marks appear, it indicates that the clay bar will damage the paint. Non sticking to the car body is a sign of good quality.