Spray new bike with teflon to repel dirt and moisture?
Back when I had a shiny new bike, I used to use car wax on the frame to keep the paint shiny, and at the time I thought it made cleanup easier because I could simply rinse the frame with a little light rubbing to get the dirt off. But I've never waxed my 3 year old commute bike and it's the same - rinse and a light rub gets the dirt off (unless it's greasy).

I haven't tried Teflon spray, but I'd be worried about it getting on the brake pads and rims, no matter how careful you are.