I have used the Maguir's stuff before. It gives a shine but not quite as much of an artificial shine that the Armor All does. Can't say long-term about whether or not it may dry out the dash over time.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record