To obtain the subject composition with high polishing ability and without adhering to any plastic parts to cause stain thereon by using zirconium silicate power as a polishing component.

This composition contains 10 to 50wt.%, preferably, 30 to 40wt.% zirconium silicate power (e.g. natural powder and/or synthetic powder having ZrSiO4 as the main component, preferably, having ≤200 mesh particle diameter) as a polishing component. Furthermore, preferably, the composition contains preferably 1 to 5wt.% viscosity controlling agent to be used for viscosity control of dispersion system, particularly, sodium montmorillonite, as an inorganic thickener having a remarkable thixotropic property, being the most suitable therefor. Thereby, this composition helps in easily removing any persistent stains on windowpanes of vehicles, particularly, persistent films due to water repellent, etc.