I see a really huge selection of different electric car pressure washers on Amazon. Can you please give some good advice on how to choose the right one? What do you think about the Kranzle brand?

Kranzle is a very good brand, but they have many different models. Which one are you interested in? I can recommend the Active 2.0, it's a high pressure washer (1600 PSI), great for beginners. And if you only choose the Kranzle brand, then look at the K1322TS, it is a very popular model today, as far as I know, and many people consider it the ideal pressure washers for detailing. But I personally would not say that. In my opinion the best one is AR Blue Clean AR630-TSS.