This is not meant to be discouraging in any way - I try really hard to offer the best advise (in my opinion and of course we all know what opinions can be like) to folks starting out.
The pressure washing industry is struggling to become a more recognized industry - we are unfortunately often looked upon as the guys who can't get a "real" job, uneducated or unskilled. As you have already indicated, the actual work is harder than it looks. The learning of the processes, chemicals, their interactions and reactions is even harder. Pressure washing is more than waving a big squirtgun around. That being said.......
If this is an industry / profession that you are serious about entering and making your livelihood in, you have to consider some very obvious factors in starting up your business. Appearance is one of them. I'm pretty sure that the post you referred to may have been one that I responded to (I will not link to the other board out of respect for this one) and if it's not, here's my response to someone wanting to work out of their car:
"This one is going to come down to more personal opinions than anything I'm betting. Nothing posted below is meant to be mean, just frank.
Think of what a customer is looking for:
Company A is hauling their pressure washer in the trunk of the car. (Mind you, this mode is a common subject of laughter in conversations amongst contractors) Within the trunk and back seat, are also various jugs of chemicals (none of which I would personally want riding inside a vehicle with me), an assortment of wands, and extension wand likely poking out of a window, hoses that will inevitably be all tangly and spastic and obviously no water tank - you get the picture. Charge for this customers home $150 for a house wash.
Company B is a fully self contained vehicle, logo'd looking like a rolling billboard, equipment safely stored in an appropriate place, chemicals secured properly, hoses probably on mounted hose reels, etc... Charge for this customers home $150 for a house wash or more (which they could probably get the extra because of the appearance)
Who would you call? Being in the business notwithstanding, as a housewife, I would no more hire Company A than the bum on the corner. As a housewife/consumer, I want any company that I hire to appear as professional as possible. I'm gonna ask for their certificates of insurance, references, pictures - anything to convince me that they're the best for me. When that contractor pulls up to my house - I want to see someone that looks like a pressure washing COMPANY, not a guy looking to make some fast cash. With a full blown rig operation, you will continue to "crank" out business and then some.
Again, this is a personal opinion. From our business perspective, we have gotten jobs because of our image and presentation rather than other companies in our area - and our prices are higher."
Next step on my soapbox - I don't think anyone goes out intentionally to do damage to an industry....however, it happens ALL THE TIME in pressure washing. This is a feast or famine business in most areas if you are ill prepared. If you start out with equipment that is not going to allow you to literally MAKE money doing the work, you may need to wait until you can properly set yourself up. It's not a cheap business. Chemicals are not inexpensive, equipment is not inexpensive, INSURANCE is not inexpensive - they all pay for themselves faster than the cheap stuff believe it or not, but they must be factored into your business plan nonetheless. One of the most hurtful things to this business is companies that are not ready to actually handle the work they want to get and poof - they're out of business. It makes the entire industry look like a bunch of fly-by-night beer money folk. When a customer sees you in a professional light - clean logo'd apparel, business card in hand, well equipped, not only do you project a good light as a professional, you also make the impression that you are in this business for the long haul because you are invested in the business.
Off my soap box.....someone else jump in here
This ain't just my novel!
Celeste