::Edit::
Looking back into your thread I see you are looking for a waterless wash solution and the most cost effective would be ultima, thought personally, I would not offer waterless washes to 90% of vehicles on the road due to the amount of impeded dirt and grit on the paints.
I won't be washing any dirty cars, only giving my show-car a once-over and quick wipe down after driving it for a few minutes once a week on the weekend's if the weather is nice. I don't like the dust that gathers on it in the garage. So, since I am not truly 'washing it' by any means, I'm just thinking of using a 300-600 gram plush microfiber with something that will offer the best of both gloss and lubricity/protection for what would simply be a 'dusting' of the car.
I was looking for whatever product would be best for this, and assumed that would be a waterless wash, although perhaps I could simply use a quick-detailer, OR, buy a concentrated waterless-wash, and really skimp on the dilution ratios, so it's almost pure for the ultimate slickness? Thoughts?
For adding a product to your normal wash, no dice. Theres nothing out there that will help with spot free rinsing and adding additional gloss. If you want streak free, you will need to use a system like CR spotless.
Bollocks. I thought for sure adding something to my usual wash solution (I use Meg's Tech Wash for now, but will start a new thread asking questions about making a switch soon as my 64oz containers run low) to condition the water making it more 'ph balanced' or neutral without the mineral deposits that can cause water spots, especially in the sun if I'm detailing a car solo and can't get to the whole thing in time before it starts to dry.
I guess I'll just stick with washing it, and then "re-wetting" it, right before walking around the car and liberally/generously spritzing it with something like a no-rinse or a QD (or even a spray wax), and then wiping that baby down with a nice plush at least 300g+ microfiber. Thoughts?
Might want to look again. Specifically at the Meguiars Australia department. With that being said, Megs LT is easily one of the slickest qd/waterless washes ive used. Try it on your car and apply some tape on it afterwards and see how well it sticks.
Believe me, I've read, and re-read, the Last Touch product description, and I just can't make heads or tails of this product's true intended specific use. Slickness is awesome, maybe it serves a purpose being added to a QD or even a waterless wash, for more protection and lubricity along with the cleaning and glossing power of those products?