Final answer:
The dwell time for a preconditioner on a synthetic carpet is typically 10-15 minutes. It is important to follow the manufacturer's instructions for best results.
Step-by-step explanation:
The dwell time required for a preconditioner on a synthetic carpet can vary depending on the specific product and manufacturer's instructions. However, a general guideline is to allow the preconditioner to dwell on the carpet for around 10-15 minutes. This dwell time allows the preconditioner to properly loosen dirt, stains, and oils from the carpet fibers, making it easier to remove during the cleaning process. It's important to read and follow the instructions provided by the preconditioner manufacturer to ensure the best results and avoid any potential damage to the carpet.