Every 3 years or so I purchase a 5 litre bottle of car wash/wax.

Today I have finished my most recent one, which is (was) Turtle Zip Wax.

All I know is this product is inferior to whatever I used last time.
Problem is....I can't remember what I used last time because it was 3 or 4
years ago!

So before I go shopping does anybody have an opinion on what is the best all
in one car wash/wax product? Simoniz, Car Plan? Halfords own brand?
Something else?


David