Once the custom rug gets off loom it goes for washing. It is essential to wash a rug to ensure that the dyes have truly bound to the yarn and is color fast. Also it washes out any dust or dirt that may have become knotted in with the yarn when making the rug. The rug is laid flat on the ground, then fresh water is poured over it. The rug washers then use a wood plank, sharpened on one edge, to force the water through the rug pile. Washing also helps to soften the wool of the finished custom rug.