I wash my own car to save money, it's really worth it. I live rurally though and the car gets absolutely filthy in the muddy lanes going to work, so it does need washing every week, otherwise you wouldn't be able to see the number plate/see out of the windows!!
I use a very soft broom, the ones you can buy cheaply in the supermarket, it MUST have a SOFT head to avoid scratching the car. And an ordinary washing up bowl. I buy some car wash stuff (3litre), the last lot I bought around the start of the pandemic and I still have some left, using it every week, just a tiny squirt in the water is sufficient, plus a watering can.
I am fortunate that there's an outside tap in our car park, otherwise it might be a problem coming down with everything from my top floor flat. However, filling up the bowl with foamy water, using the brush to wash the car, I do half the car and rinse it by pouring a watering can full of water over it, then do the other half, refill and rinse again.
Doing it this way is very quick and saves you getting absolutely soaked like you do if you use a sponge etc. In summer I dry off the car with a proper cloth, mostly because it's nice to be outside and because I don't want droplets drying on my windows. In the winter I don't bother, the car gets muddy very quickly again so a nice wash and rinse is far better than the alternative.
The car wash near us is £5 a time, I think of all that money I'm saving for a quick half hour doing it myself.