Vinegar Magic: Harness vinegar’s innate cleansing prowess. Spritz white vinegar over the stain, let it act, scrub, and rinse. Its acidity combats both mineral deposits and fungal agents.

Baking Soda Touch: Craft a paste using baking soda and water. Smear this over the stain, scrub mildly, and wash off. The granular nature of baking soda scours off stains while neutralizing smells.

Preventing its Return:

Consistent Cleaning: Keeping that black circle at bay demands regular bathroom cleaning. Consistently disinfect, focusing on the toilet base.

Ventilation Vitality: Deploy exhaust fans or ensure windows stay ajar during and post showers. This curtails moisture, deterring mold and mildew.

Plumbing Vigilance: Drips or moisture near the toilet’s base can instigate that black circle. Spot plumbing anomalies early and rectify to avert water pooling.