I'm not interested in a 5 to 10 step process to get the car in show condition, just a really nice end result with not too much fuss.
Then have to agree with WayneBatt - should seriously consider a sealant like Opti-Coat and various others, does wonders to reduce the retention of dirt particles to the body and makes cleaning the body (and leather if you get it treated) a breeze, stuff just rinses off. I used Opti-coat on my car exterior, Opti-Guard on my leather.
Ultimately its hard to clean a car properly without a 'series of steps', even without 'show room condition', but like anything, purchasing the right tools of good quality - makes the job easier, quicker and far more effective.
TLDR; version below...
If you snow foam your car and rinse as required before it gets too dirty and making sure you immediately remove bird droppings etc when it happens - its really down to 5 steps for the whole car, inside and out, and takes no time at all.
1. Pre-Rinse and Snow Foam - pressure washer - 5mins + dwell time - do your rims or something while you wait etc??
2. Wash off - pressure washer - gentle setting, roof down to rims and tyres - 5 mins
3. Dry off - Takes the longest if you dont have an air-dryer, takes me about 20+ mins to hand dry my wagon to get all the remaining water runs from cracks.
4. Vacuum interior including all dash crevices and carpet mats etc- 5-10 mins? (usually do this and go back and do a final dry as water runs out of cracks)
5. Treat interior - leather\dash\Tyres - 10 mins
If EXTRA DIRTY - a GOOD pre-rinse, let the snow foam dwell longer and start washing with 2 bucket method and good quality wash mitts and car wash - see below.
Adds maybe 30 mins depending on how dirty, how many 'fresh' buckets of water, how carefully and slow you wash, blah blah.
So ... it costs a bit upfront to get setup properly.. but so did your car I imagine....
Check out 'Car Car Products' sponsor and products in this forum. I purchased all my products through them and they have forum discount for some of their items.
FYI - My 'gear'
Opticoat Body - Tick
Optiguard Leather - Tick
'Gerni' brand pressure washer with aluminium\metal pump etc - Tick
Autobrite - PA \ Quality Foam Lance - Tick
Mint Snow foam liquid - Tick
Duragloss Car wash\Shampoo - Tick
Microfiber wash mitts x 2 - Tick
X Large Waffle Microfibre (good quality) cloths x 3 - Tick
Buckets x 2 and "Grit Guard" - Tick
If used properly with 2 bucket method, good quality microfiber wash mitts and drying cloths are pretty good \ minimal (microscopic) to no damage.
If used poorly \ not rinsed etc.. then yeah .. you will have problems, scratch up your car etc.
An Air Dryer does get down into the nooks and crannies that leaves little bits of water behind when drying with waffle weave cloths, eg mirror edges and the like.
I am still undecided also on the best air dryer to purchase etc. Wondering if I should multi-purpose and get a decent 'leaf' blower sized one - or something like that Makita.