AG Mechanics CDE Practice Exam 2026 – The Comprehensive All-in-One Guide for Success

Question: 1 / 400

What is used to clean a foam air cleaner?

Kerosene or liquid detergent and water

A foam air cleaner is typically cleaned using kerosene or a liquid detergent mixed with water. This mixture helps break down the dirt, grime, and oil that can accumulate on the foam filter. Kerosene or detergent is effective at dissolving these contaminants without damaging the foam material. It is important to clean the foam air cleaner regularly to maintain optimal engine performance and air flow. Mineral spirits (option B) can be too harsh for the foam filter material, water alone (option C) may not effectively remove oil and grime, and WD-40 (option D) is a lubricant and water displacer, not a cleaner.

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Mineral spirits

Just water

WD-40

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