Well Team, I haven't been very friendly lately - more lurking than saying, so here's my 10c worth.
I use Motul bike wash. It comes in a 4 litre container and cost about $43 NZ. Spray it on from a pump action spray type thingy leave it 10 mins and hose it off, followed by a chamois leather wipe. Removes all the road dirt and bugs and is usable on all surfaces.
Personally I hate dirty bikes, I always think dirty bikes are owned by lazy people.
Bikes are supposed to look nice and sparkling and if like Pitter you wash the auto every week, you should also do the bike. $hit, it only takes about half an hour unless you hit a Wallaby and it chokes the engine fins