What stains and problems are common on New York City concrete?
City concrete collects a mix of grime that suburban slabs rarely see.
- Soot and exhaust film. A gray layer builds up fast near traffic and shows clearly when only part of a path is cleaned.
- Gum and spills. Sidewalk gum, food and drink stains need heat and patience, not just pressure.
- Oil and grease. Cars, garage doors and dumpsters leave dark patches.
- Rust. Fire escapes, railings and iron gates stain steps and stoops orange.
- Salt residue and mildew. De-icing salt leaves a white film, and shaded courtyards grow green or black mildew.
Old, flaking concrete needs care. High pressure can pull the top layer off a weak slab, so we check the condition first and adjust.

