improvement stores. rinse lightly with clear water.
mix a squirt of liquid dish soap into a cup of warm water; then dip a white cloth into the liquid. blot the dirty spots, holding the cloth atop the carpet for several seconds each time. check the cloth frequently and rotate it to prevent putting dirt back onto the carpet. wipe the area again with a rinsed white cloth; then blot up as much moisture as possible with a fresh white cloth. 