I NEVER do anything less than a complete wash and I usually use a QD after each wash. I just don't trust the California Duster or the QEW process on a dry vehicle. I don't get just a little dust from my road, I get layers of it.
I am one very careful old guy. Until last summer, I had never used a sealant. I always used pure carnauba waxes or cleaner waxes.
Tom :cool