There are many things I would have done differently:
Bigger van from day 1, it cost me a fortune changing vans & kitting it all out again
Forget the trolley, I'd go van-mount from day 1
Fixed reel from day 1
Wouldn't have listened to Matt on the DIY forum saying a 50gpd RO would be plenty,.. I would have got a 400gpd pumped RO from day 1 & never ran dry!
I would never trust an inline TDS meter
I would be more careful about what other "cleaners" I worked with on big jobs, as their failing reputation could adversely affect mine by association.
I would have dumped a lot of custies on day 1 (took over a round of messers from my father in law!)
Gardiner poles & brushes from day 1, no messing with flagpoles & autobricks auto-brushes
Split charge relay from day 1
I would have bought a pressure washer & X-jet straight away, its a great wet weather earner.
Priced higher from day one, and concentrated on one off/irregular cleans. Where I am (Ireland) there is a lot more of this work than the standard 6 weeklys, and it can be priced a lot better too.
I would never work in schools again (Daily classroom cleaning, not windows) as the profit margin doesn't justify the stress.
I'd never do carpet cleaning again,.. too much equipment cost for the return if you're not doing it full time.
I'd pay the extra for a decent graphic design company to do the van signs instead of going with the cheapest.
Every mistake has taught me something though,.. so if I didn't make those mistakes then, i'm sure I'd be making new ones in the future!