I use Zaino - (Sealer)
It seems to last ~1 month if the car is out a lot, ~3 months if the car is in the garage more.
It's also a wipe on/wipe off deal couldn't be easier....
The only downfalls are price and availability (Web/small dealer network vs. high volume stores).
But overall I typically spend ~$50 every other year on it for 4 washes per car (3 cars).
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1996 Z-28: Bolt-Ons, Harwood Cowl Hood, 18" Black Z06s
2005 Subaru Legacy GT - Stage 2 - My DD
2012 Audi S4 - The Wifee's Ride (Wait - the wife drives the fastest of the stable?  )
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