We have an SUV and a sedan. I rarely washed both on the same day. Washing was not the problem. Setting everything up and putting it away was.
I used a greenworks portable pressure washer. Every wash meant carrying it out of the garage, connecting the water and power, and dealing with the pressure hose.
The hose would not always reach the second car or the other side of the driveway, so I had to move the machine and rearrange everything.
After finishing the first car, I usually left the other one for the next weekend. Then I had to wind up the hose, put away the cord, and carry the washer back inside.
I recently switched to a giraffe tools pressure washer near the garage door. The 100 ft hose reaches both sides of the driveway, so the machine stays in place. I pull out the hose, wash the cars, then retract it when I’m done.
I still wash one car at a time so water and soap do not dry on the paint. Washing two cars takes about the same amount of time, but I only set up and pack away once.
Do you wash all your cars on the same day? Did a longer hose or fixed pressure washer make you wash them more often?