Cars used to have so many nooks and crannies that it was a nightmare. Chrome sills and vinyl roofs. My dads Fiat 132ES (so rare that I can't even find it on Google) was so filled with hard to get spots that it used to take me 2 hours to clean.
And yet current cars are so easy that I can't understand why folks pay 6 or 7 quid to get them cleaned badly by a machine at their petrol station. I clean my car about once a month. It takes about 10 minutes to soap it down, then another 10 minutes to clean the alloy wheels and 5 minutes to rinse it off with the hose. Yet in over 2 years we have been living on this road I haven't seen anyone else wash their car on a Sunday (or indeed any other day) ever!
The sad thing is that when I have reason to visit a petrol station on a Sunday I so often see a huge queue of cars waiting for the car wash machine. And so often it is Dad with junior in the passenger seat. I hope junior isn't getting their pocket money for just sitting there :-(