Surface streaking on polished bronze sculptures is a common issue that can detract from their beauty and longevity. The most frequent causes include oxidation, improper cleaning techniques, and environmental exposure.

1. Oxidation: Bronze naturally reacts with oxygen and moisture, forming a patina. However, uneven oxidation can lead to streaking, especially in humid climates.

2. Improper Cleaning: Harsh chemicals or abrasive materials can strip the protective wax layer, causing uneven surfaces and streaks. Always use pH-neutral cleaners and soft cloths.

3. Environmental Factors: Pollution, salt air, or acidic rain can accelerate tarnishing and streaking. Indoor display or regular protective coatings can mitigate this.

4. Residue Buildup: Dust, fingerprints, or leftover polishing compounds can create streaks if not thoroughly removed.

To prevent streaking, clean sculptures with gentle solutions, apply protective wax annually, and avoid placing them in high-humidity or polluted areas. Regular maintenance ensures your bronze art remains pristine for years.