Ahmed bhai i used the F21 today; things i noticed.
Smell was like Pre-Soak, which made me hink if it's pre-soak in a more diluted solution.
The liquid is less thick than Ice shampoo. The results were nice, but it is too early to decide that since only used it once today.
The suds produced were good enough and definitely it is a little mild than Ice, why? because i have a tub in which i make the solution, usually that tub is 3/4 filled with 5-7(dependent) caps full of shampoo, with one hand dipped in the solution i check for its lubricity and slipperiness to make a solution best suited for the dust condition on the car, this time around with 21 the basket was 1/2 full and i had put in the same amount of shampoo, yet the solution prepared wasn't too sticky and slippery which in my opinion shows that it is a little on the mild side, creating less lubricity(soapy slippery feel). But please do not confuse what i'm saying with it's cleaning ability, it cleans very nicely and removes dust and grime in a great manner, nothing suspicious about it's cleaning ability.