scouring means?abrasive means?

Scouring:

• The sheared skin with hair of sheep is then washed thoroughly to remove dust, grease, or dirt, this process is termed as scouring.
• Scouring can be done in tanks or by machines. 
• Cleaning of the shaved wool from the body of the sheep,Sometimes may harmful germs so it must be cleanly washed so that the user will not receive any diseases or harmful effects from using the woolen item.

Abrasive:

• An abrasive is a material, often a mineral, that is used to shape or finish a work piece through rubbing which leads to part of the work piece being worn away.
• While finishing a material often means polishing it to gain a smooth, reflective surface it can also involve roughening as in satin, matte or beaded finishes.
• Common uses for abrasives include grinding, polishing, buffing, honing, cutting, drilling, sharpening, lapping, and sanding.