I almost always wash/wax by hand. But I have found the spray it yourself wash is great for getting off the salt (not that you will have much salt in FL, perhaps from the beach?) Also, after a good underbody spraying with soap and rinsing, I have occasionally sprayed the underside with the high pressure wax, I can't wax that stuff under there by hand, and I figure it can't hurt.
NEVER use one of those "soft cloth" carwashes, unless you like scratches.

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2001 SE 4x4 5-speed
Super Black