OK, this comment is a very general one and not targeted in any way to the OP because there are a multitude of options ranging from nothing to everything - the choice all depends on the individual. And assuming that people don’t want to be a slave to washing their cars…
Broadly speaking, some people want and are prepared to pay for the best, some people just want a shiny clean loooking car. Probs 95% of the population fall in to the latter (even if some of those think they want a higher spec).
So, as a base point, I would offer three suggestions….
1) Utilise a mobile valeter on a periodic basis - do whatever you want in between visits, or nothing at all.
2) Use a waterless wash ‘n’ wax (yes the much derided type often bought from shopping channels) although I would use that in a safer way than advertised.
3) Utilise a ‘hand car wash’ - sometimes an ethical and practical minefield for me personally.
The above will absolutely satisfy 95% of the market. Feel free to pay my consultancy fee in to a fundraiser