Exposed aggregate concrete cleaning is the one flatwork job where overdoing it produces something that still looks like the finish. The stones are not glued to the slab. They sit in sockets of cement paste, and the depth of that socket is the only thing holding them. Take paste off the top and you have
Removing transmission fluid stains is an oil-removal job with a colourant riding along inside it, and that colourant is the only thing separating this mark from every other petroleum stain on a driveway. The red is not the oil’s own colour. It is a dye somebody chose, specified and paid for, so that a leaking
Removing leaf stains concrete depends on one thing you can check from standing height: is the mark brown, or is it nearly black? A brown mark is tannin, and an oxidiser will take it apart. A black, grey or blue-black mark is tannin that has found iron and become something else entirely — a metal
Cleaning farm equipment turns out to be mostly a dry job, and the four components a pressure washer damages on agricultural machinery are named in a single sentence of John Deere’s own combine manual: bearings, hydraulic seals, electrical connectors and fuel injection pumps. There is a neat problem buried in that. The reason anybody drags
Removing antifreeze stains is the easiest part of dealing with an antifreeze spill, and treating it as the whole job is how the dangerous part ends up spread across thirty square feet of driveway instead of sitting in one place where you can pick it up. Coolant is water-miscible. It comes off concrete far more
Cleaning a limestone patio is unusual among stone jobs because there is nothing inside the slab to lose — no gas voids, no factory fill, no bedding plane waiting to part — which sounds like good news right up to the moment you work out what that leaves. It leaves the surface. On a sawn
A wet sandblasting attachment adds water to an abrasive process for one reason, and it is not cleaning: the water is there to hold the dust down, and it does almost nothing to the cutting action of the grit travelling inside it. That sentence is not mine. It belongs to the National Park Service, which
Removing BBQ grease patio stains is a race against a chemical reaction, not against absorption. While the splash is still a fat, warm water and an alkaline cleaner lift it the same evening. Once it has taken up oxygen and cross-linked, it is a solid film that is insoluble in water and in most solvents,
Removing paint overspray concrete has soaked up is a different job from removing a paint spill, and the difference is geometry rather than chemistry: overspray arrives as thousands of separate droplets, each one a complete coating in miniature, spread across an area far too large to treat one dot at a time. Every page I
How to remove mildew odor, in one line: kill the colony, physically wash off the residue it was living in, and then dry the item all the way through — because the smell is a gas the mildew produced, not the stain it left behind, and only the drying step keeps it gone. Those three
