Don't know how megs would work over zaino - but i'd stick with the zaino till you get low as it's a lot of money!!
www.bettercarcare.com is a great place to start john - but as a minimum for a black car:
Buy a good deep pile lambswool wash mitt (megs = £9.99) as this draws dirt into the pile and prevents scratching - a sponge acts like a bit sandpaper if any dirt on the surface.
Wash wheels first then change the wash mix - this prevents water spots drying on the car if you wash the wheels last.
use two bucket method to wash car - one with wash mix one with clean water - dip mitt into clean water and rinse everytime prior to dipping in wash mix - this keeps your wash mix clean and grit free and helps reduce swirls.
never use your mitt to wash wheels, sills etc as this could cause swirls with ingrained dirt or brake dust which is also abrasive.
Dunno if zaino do one but get a bottle of quick detailer and a large MF drying towel. To dry the car i lay it on the car and gently drag it over the paint - a bit like a water blade - this gets rid of most of the water and put's little pressure in the clear coat - avoid nasty water blades!!
then a quick squirt of quick detailer on the the car and wiped off with a good fine MF cloth for that "just waxed look".
sounds like a lot but in reality all the above takes 30-45 mins to do!