I spent a weekend helping a friend clean out a hard loft in a converted industrial building. Exposed brick, concrete floors, twelve foot ceilings, the original ductwork still running across the room at head height and above. It is a beautiful space and she had been living in it for about a year.
She had been cleaning it constantly and could not work out why it never felt clean.
The problem was not where she was looking
Everything she could see and reach was spotless. Counters, floors, the kitchen, the bathroom. She had been doing that weekly and doing it well.
Ten feet up, the ductwork had a year of dust sitting on top of it in an even grey layer. Same on the sprinkler pipe, the conduit runs, and the tops of the original beams. From the floor you could not see any of it, because you were looking at those surfaces edge on. The only way to know was to get up there.
Then every so often the HVAC would kick on, or somebody would slam the door, and a bit of it would drop. She would clean the floor again. It would be dusty again in three days. She had concluded that the building was just dirty.
Why this stuck with me
The pattern is uncomfortably familiar if you work on systems for a living.
The stuff you can see gets attention because it is the stuff you can see. The dashboard you check is the dashboard you built, and it covers the things you already thought to instrument. Meanwhile the actual source of the recurring problem is sitting in a layer nobody looks at, quietly accumulating, and periodically dropping into the part you do monitor.
You end up cleaning the floor over and over and calling it maintenance.
What fixed it
Working top down. Poles, a ladder, and starting with everything above head height before touching anything below it. If you do it the other way round you clean the floor twice and you will not understand why.
That is apparently standard practice for anyone who does this professionally. When I looked into it afterwards I found a company that writes about deep cleaning in Riverside and specifically calls out the high dusting on exposed ductwork as the reason loft owners think their place is cursed. Not a complicated insight. Just one nobody had told her.
The transferable bit
When something keeps coming back after you fix it, the fix is probably not at the level you are working. Go up a layer. Look at the thing that has never been instrumented, never been logged, never been cleaned, because nobody could see it and therefore nobody thought about it.
Then work top down.
Her loft has been fine for six months.
