The Sonax helps a lot if you have a pressure washer. I only wash my car once a month (yea yea I know), so the build up is pretty bad. Too busy at work at the moment.
But I will say there are cheaper products out there that do the same thing. I use Eagle One wheel clearner now. Like $5 a bottle, leave it on for about 2 mins, pressure wash wheels. Then go back with soap using Daytona brush, sponges ect...
P.S. Sonax would be useless if you didn't have a pressure washer IMO. I don't think it would significantly cut down your time.
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Current:
16 F82 M4 GTS, Black Sapphire/Black, DCT
08 E92 M3, Sparkling Graphite/Bamboo Beige, 6MT
07 E85 Z4M Roadster, Alpine White/Red, 6MT
99 E36 M3, Techno Violet/Dove Grey, 6MT
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