I'm pretty anal about my cars looks, but I'm also lazy, so I've got a few tricks that might work for some people.
Once a year Meguiars 3-step + clay bar, I don't care for the wax from the last step so I use Meguiars paste wax instead. I apply it with my fingers and then power buff it off ($20 wally world special buffer). Whenever I wash it, I follow up with Honda Spray Polish/Cleaner (will do my bike 10+ times, my car 2-3x), it's aerosol and you just wipe if off with a microfiber towl. Leaves a much better finish than any of the other spray detailers I've used. For washing & drying I use ONLY microfiber towls.
Interior I use simple green, diluted 16:1, for everything from the carpet to the headliner. For nasty carpet I let it soak a bit, then a course brush. All fabric gets wet/dry vac'd. Even takes out smoke smell and leaves a nice odor. Vinyl and plastic I use the old Honda vinyl/leather protector (squirt bottle). Can't get it anymore though, they switched to some goo stuff so I bought the last case of the old stuff from the dealer.
Engine bay gets Simple Green (diluted 16:1 if it's relaivly clean) & power wash, followed by liberal application of aerosol silicon spray. The silicone gives the plastic the shine back, but does not attract dirt like Armor All.
Wheel wells I just power wash out, then liberally apply flat black spray paint. It doesn't last long, but it's cheap.
My brothers 160kmi civic after the afore mentioned 3-step & clay bar.
Oh, the Honda Spray Polish/Cleaner works great on plastic headlights, taillights, and helmet visors really well also.