1)   How to use a magic clay bar? 
please check the step by step of car washing process. 
2)   how to stock the clay bar and reusable?  
the clay bar must be wrap a film or in inner blister.
here a picture show how to use the clay bar. 

3)  imrpoved King clay bar, the blister inner box replace the film of clay bar.  it is more easy and better for using and reusable.  (the step 5 is different now.)

Auto Care Clay Bar is the safest and most effective way to remove contamination from your vehicle's paintwork.New Technology easily removes overspray, rail dust, brake dust,pollution and contamination for a smooth-as-glass feel.The Clay Bar removes embedded contaminates that reduce the shine of your paintwork.The Clay Bar works great on paintwork, glass, plastic and metal surfaces.