Expensive Car Shampoos - necessary?

Car shampoos are the highest volume sellers in the detailing products market, and naturally, mftrs have CREATED a need for premium-priced shampoos to entice car enthusiasts. Premium-priced shampoos with glitzy packaging and hyped with "marketing fluff" aren't gonna make your car any cleaner than a normal car shampoo. If you know how to wash your car properly,spend the proper time to do it correctly, and wash often, any ph-balanced car shampoo from any reputable mftr will the job equally well. If you want your layer of wax or sealant to last as long as possible, MINIMISE contact with any car shampoo or any detergent. Wash with your mitt and rinse immediately. There is no benefit in leaving the shampoo suds on a surface that you've already agitated with your wash mitt unless that surface is extremely stained and thus, require extra dwell-time to loosen the stains. If you do a blind test on 2 identical cars, with each being properly washed with different shampoos, no one can tell the difference. Can you tell which brand of shower gel I used last night? NO.