[Perfectlap]

I used to live next door to this lot that housed one failed eatery, lounge, and catering hall after another, they all closed. One guy was smart enough to tear down the building and build this huge automatic drive through tunnel car wash
with a Mobil 1 oil change garage and full detailing shop.
It was all glass and you see the cars driving through it. He had a big section inside where he sold detailing stuff hinges.
The place runs 24 hours a day and you could get a half price car wash after midnite. I think I calculated that he was making $300 per hour or at least $5,000 a day, a million dollar a year car wash??!! (wonder what the water bill was like). It was located just off a big highway so he had a never ending line of cars going through it.
I was truly intrigued by this whole operation and I took my old black car there, and in doing so it ruined the paint. But because of this stupidity I was forced to learn about the PC and swirl removal. All that damage was erased in a few hours.
Something the autobody shops forgot to mention when they said I would need a full repaint!

As for your undercarriage, Unless you have a concours car or live an area where they are doing allot of road work and have tar issues I wouldn't worry about cleaning under there. When the weather breaks just get some of those Meguiar's Gold Class brushes with the long handles and a bucket of soapy water, Simple Green and go to town. For the areas close the outside of the car like wheel wells, under the bumpers and rockers you can use the same OXO type feather brush with a No-Rinse solution. It's only going to get dirty again...