Bowden's Own Agent Orange - It would seem Agent Orange is as effective on a Vietnamese person's engine bay as it was on the Vietnamese
This stuff is fantastic. Depending on the amount of dirt/grime you have in your car, you may not need to use a brush at all. Tougher stains such as oil spill + dirt accumulation will simply need a light brushing before you rinse. Incredible engine bay cleaning power with very little effort.
Did my dad's Gen4 Camry, this is 168,000km old and has NEVER had an engine bay clean in it's life. You can see the obvious difference between the two, this clean was done with NO scrubbing/brushing whatsoever. You can see the front-rocker cover is leaking and could have done with a scrub before it was rinsed.
Bowden's Own Auto Body Wax - A little on the expensive side but you'll appreciate the little effort required for good results
A great product. Easy to apply and EXTREMELY easy to remove, this was provides a good shine and a good just waxed feel which lasts. It has good water sheeting properties and seems to repel dirt well. After speaking to DJKOR, it may seem that this may be more suited to darker colours as it doesn't seem to have the same 'bling factor' on his lighter car. Another big plus is that this wax can be layered due to having zero-abrasives.