- Requesting references or viewing a portfolio of their past projects can give you insight into the quality and reliability of their service. 4. **Do you offer any guarantees or warranties on your work?

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2 days, 22 hours ago in Power washing service

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- Requesting references or viewing a portfolio of their past projects can give you insight into the quality and reliability of their service. 4. **Do you offer any guarantees or warranties on your work?