Your contractor's "final cleanup" likely involved wiping surfaces with a cloth. That cloth may have dragged Mohs 7 silica particles across softer surfaces like marble countertops — which can leave fine micro-scratches.
The Mohs Hardness Problem
The Mohs hardness scale ranks minerals from 1 (talc) to 10 (diamond) based on scratch resistance. The rule is simple: any material can scratch any material softer than itself. Crystalline silica — a common component of concrete dust and grout residue — rates Mohs 7.
Here's what that means for your renovated home:
| Surface Material | Mohs Rating | Scratched by Silica? |
|---|---|---|
| Marble / Travertine | 3 – 4 | Yes — scratches easily |
| Hardwood flooring | Varies by species and finish | Yes — micro-abrasion |
| Limestone | 3 – 4 | Yes — etching + scratching |
| Tile glaze (ceramic) | Varies by glaze | Yes — can dull over time |
| Stainless steel | Varies by alloy | Yes — can show fine scratches |
| Granite / Quartzite | 6 – 7 | Borderline — depends on grade |
| Crystalline Silica (dust) | 7 | — (the abrasive) |
Materials in the "Yes" column can be scratched by hard silica dust. When a cleaning cloth wipes across these surfaces, the silica particles can act as an abrasive — leaving fine scratches in the finish.
Push-and-Pull vs. Lift-and-Remove
This is the fundamental distinction between standard post-construction cleanup and a cleaning checklist:
- Push-and-Pull (standard) — A cloth or mop head presses down on the surface and drags particles laterally. Every particle between the cloth and the surface acts as sandpaper. The harder the particle (Mohs 7), the deeper the scratch on the softer surface below.
- Lift-and-Remove (vacuum first) — A good vacuum pulls loose dust up off the surface before anything touches it. There is less dragging, so the dust is less likely to scratch the finish.
The difference is easy to miss on day one. Over time, wiping gritty dust across polished marble and hardwood can leave a dull haze.
What Helps After a Remodel
After a remodel, the first job is to get the loose dust up before wiping. A Post-Construction Clean starts with thorough vacuuming, including edges, vents and under furniture.
Next, the cleaner wipes surfaces with a clean, damp cloth. A damp cloth picks up fine dust instead of pushing it around.
Steam can then be used on suitable hard surfaces such as tile and grout. Our cleaners use products that are safe for your surfaces, with extra care on stone, wood and stainless.
Why This Matters for San Diego Homes
San Diego's coastal luxury market — La Jolla, Coronado, Del Mar — features many marble, travertine, and imported stone surfaces. These materials sit at Mohs 3-4, so they scratch more easily than silica.
Combined with the region's natural sand ingress (beach silica is also Mohs 7), post-construction homes near the coast face a compounding problem: construction dust plus environmental silica, both grinding into luxury finishes.
Protect your investment: Schedule a Post-Construction Clean — $75/hr per cleaner, 3-hour minimum.