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This yellowing effect most frequently results from several sources:
1. Cleaning with a solution that is too caustic (too high a P.H.). 2. Alkaline off gassing from concrete being from prevented from normal dissipation by covering carpet with plastic protectors etc. 3. From water damage.
To correct the discoloration:
Step 1. Thoroughly hot water extraction rinse the carpet with a solution of Last Step Rinse. Leave carpet as dry as possible. Step 2. Apply a dilute solution of CSS with a pump sprayer.
Tip: Groom carpet and allow to dry before use. Discoloration should disappear as carpet dries.