I have similar issues with getting water to the car, I would need 80 metres of hose pipe to get water close enough to wash my car!!
I dont like the drive through car washes as I have seen the damage they can do, and wouldnt risk the Eos anyway.
I have a mobile cleaning service who come to the house once a month, he has a fully equipped van with water tank, generator for pressure wash, vacuum cleaner and carpet shampoo, and a van full of potions and lotions to keep things looking good.
Every visit I get pressure wash for wheels and under the arches, hand wash of the body work with drying off and a polish, glass inside and out as well as hoover inside and surfaces cleaned and shampoo the mats to keep them clean. Car always looks fantastic afterwards and if you average the cost out it is less than a pound a day.
For the aggravation it saves me I am happy to pay as I see this as protecting my investment.
Tim