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Poliseal is less abrasive than DG501 but has excellent chemical cleaning. Either is a good choice.
From my understanding Dg501 contains no abrasives and is strictly a chemical cleaner and sealant. If you want really light correction work and slight protection go with poli-seal. If you want a chemical cleaner with great protection go with DG 501.
Speaking of Poli-Seal, you can apply Opti-Seal over Poli-Seal and it will re-position itself under Poli-Seal, correct Chris? I wish I would have done this to the Accord and performed a final wipe with OCW. I'm still learning to use Optimum to it's full capacity.