Removing White Mineral Deposits from Clay Pots: Safe and Effective Methods

What It Is

White crust = concentrated salts from water-soluble fertilizers or hard water (calcium/magnesium carbonates).

Scrape with sharp tool or wire brush (may mar pot).
Dishwasher: Run empty pots on longest cycle. Detergent salts dissolve deposits. Repeat if needed.
Soak: Submerge in water + 1 cup washing soda (sodium carbonate, not baking soda) per 5 gallons. Soak several days.
Acid bath (last resort): Dilute muriatic (hydrochloric) acid or phosphoric acid (masonry cleaners). Dangerous—wear protection. Rinse thoroughly, then soak in clean water.

Use rainwater or distilled water; leach pots periodically by heavy watering.

Plant Diseases: Yellow‑White Coral‑Like Growth on Terracotta Pot Rim: Harmless Fungus; Improving Clay Soil Drainage for a Healthy Lawn in Texas; Improving Clay Soil on a Farm: Plants & Techniques for Better Drainage; Cooling Darlingtonia Pots with the Zeer Pot Method: Sand vs. Perlite; Can Sarracenia Be Grown in Clay Pots?; White Chalky Deposits on Clay Pots: Causes and Removal; Daffodil Bulbs in Covered Balcony Pots: Winter Watering Guide; Storing Empty Clay Pots Outdoors in Winter; Clay Pot Mold: Why Plastic Pots Are Better for Herbs and Miniature Roses; Cleaning Salt Deposits from Clay Pots with Vinegar

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