My routine is simple.
Go round to the Albanians/Romanians who do a brilliant job of washing my Jazz. First pressure rinsed, then using a mit they soap it all over, then rinse and finally spray with a wax type mixture and rinse down. Dried with chamois leather. Vacuum out the inside and shine all the glass, clean the carpets and blacken the tyres. £12, no effort from me and fifteen minutes of my retired day. Sorted.