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Use WD-40
To Remove Calcium Buildup From Your Garden Planters
By WILL FORD
To use WD-40 to remove calcium buildup from the outside of planters, start by removing any excess dirt or debris from the surface. Use a soft cloth or brush to clean the planter.
Next, shake the can of WD-40 well to mix the ingredients. Hold the can about 6 to 8 inches away from the planter and spray a light, even coat of WD-40 onto the affected areas.
Avoid overspraying or saturating to prevent potential damage to both the planter and the plant. Let the WD-40 sit for about four to five minutes to loosen the calcium deposits.
Gently scrub the affected areas with a soft cloth or brush to clean the calcium deposit, and rinse the planter with water to ensure all remnants of WD-40 and calcium are removed.