With any product, even the Dodo Juice shampoos take off protection. The reason for this is because people tend to put more shampoo on that the chemists specify. When they say "will not strip wax", it wont strip wax if you follow the correct quantities.never knew that it is not like Dodo juice shampoos that are not meant to strip wax off then (after each wash I would re-apply wax anyway)
You shouldnt really be reapplying wax after every wash. Remember the more you touch your car the more your increasing the potential to scratch/swirl the paint. Also the more layers of wax you put on you will get yellowing as there are too many layers of wax on.
Get a good wax like Autoglym HD or Collinite 476S and wax every 2-3 months.