Collinite Wax Question?

I realize the 845 will outlast the P21S hands down, but I get 6+ weeks of self-cleaning/tight beads and incredible ease of application from the P21S. It's always nice to find a new favorite, though. ;)



For those out there that have tried both, how does the 845's self cleaning ability compare to the P21S?
 
I realize the 845 will outlast the P21S hands down, but I get 6+ weeks of self-cleaning/tight beads and incredible ease of application from the P21S. It's always nice to find a new favorite, though. ;)



For those out there that have tried both, how does the 845's self cleaning ability compare to the P21S?
 
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