Hi Roshan...
I've mentioned before that the terminology: "drying aid", when used on detail forums to describe
a product used to assist in manually drying/removing-moisture from a vehicle after a car-wash session,
has taken some neuron-rerouting to adjust my previous understanding of its use/definition.
That previous understanding came from my being introduced back in the 1960's to products used to cause
water to
"break"... instead of it just sheeting-
on/sticking-to vehicles' surfaces... after they had been
subjected to prior usage of high alkaline chemicals (>7ph) to presoak and for further cleaning of said vehicles.
However...
With most of us seemingly now using "ph-neutral" car wash shampoos,
the aforementioned drying-aid products/practices appears unwarranted.
Still...
-The use of a reputable company's QD's/WW's, in order to reduce the visible signs of water
"that has broken",
doesn't seem to cause harm...if used with proper tools/technique, that is.
-For this above drying-aid process I'll use one of Meguiar's QD's/WW's, or even one of their spray waxes.
Optimum has several products that fit this particular drying-aid definition as well.
But for my original "drying-aid definition"...
-IMO...It doesn't get any better than:
"Negev-99 Super Drying Agent"...(Think of an arid Desert)
Bob