CT 18 Super wash 6L $24.12 off Now $17.87 at Super Cheap Auto Ends 17/06/18
Percentage wise I'll leave that up to someone better at maths than me.
The major benefits of this cleaner is, it does NOT SET or DRY. With other chemicals/cleaners if they dry on or set, you have to mix a stronger batch to apply over the first coat to remove the original application.
Pair this up with a $10 5L pump pressure sprayer from Bunnings and you can do the engine bay in no time. I mix mine at 20:1 for engine bay (200ml to 4L of water). Apply on a cool engine bay, spray and run away let it soak in for 1-5 hours and rinse off.
As for car paint work. I don't recommend it as a every week/month cleaning agent for cars with clear coat. But for the once a year or every two years to remove wax build up, bugs and tar. It is great. Also awesome as a rim, wheel cleaner too.
Or if you are doing works or renovations I use it as a prep before splattering windows and doors (especially aluminium) with concrete, plaster dust etc (outside only) or any area not under foot (slippery little sucker) as it will be the binding layer, not the dry, suck every bit into the surface layer. Do one or two coats and leave it for 1-3 weeks, then rinse off.
I also use it for around the house as you can apply it, let do the work for you, then rinse off when you like.
PS: As works awesome in the kitchen as well.