Descaling Hard Water Buildup in Ontario
Ontario municipal water — particularly in the GTA, Hamilton-Niagara region, and other areas drawing from the Great Lakes — is relatively hard by North American standards. The calcium and magnesium that make Ontario water "hard" leave white or grey mineral deposits (limescale) on every surface that water touches and evaporates — faucets, showerheads, tile grout, shower glass, and kettle interiors. These deposits accumulate over time into significant buildup that traps bacteria, reduces water flow, and makes surfaces look dingy regardless of cleaning.
What Dissolves Limescale
White vinegar: The most effective and accessible descaler for home use. Acetic acid in white vinegar dissolves calcium carbonate (the primary component of limescale). For moderate buildup: apply undiluted, let sit 30–60 minutes, then scrub and rinse. For heavy buildup: extend the dwell time to several hours or overnight.
Citric acid: Available in powder form at grocery stores, citric acid is more potent than vinegar and excellent for kettle descaling and soaking components. Mix 1–2 tablespoons in a cup of warm water, apply, and let sit.
Commercial descalers: Products like CLR or Lime-A-Way are phosphoric or hydrochloric acid-based and are faster-acting than natural alternatives — appropriate for severe buildup, but require more careful use (gloves, ventilation) and should not be used on some surfaces (certain metals, natural stone).
Showerheads
Remove the showerhead if possible and soak in white vinegar overnight. If removal isn't practical: fill a plastic bag with white vinegar, secure it around the showerhead with an elastic band so the head is fully submerged, and leave for 2–4 hours. Run the showerhead for a minute after to flush dislodged deposits.
Tile and Grout
Spray undiluted white vinegar on tile, let sit 10–15 minutes, then scrub. For grout specifically: a paste of baking soda and vinegar (it foams — that's fine) applied with a grout brush. Do not use vinegar on natural stone tiles (marble, travertine) — it etches the surface.