As a subject matter expert in the field of chemical cleaning agents, I can provide you with a comprehensive answer regarding the use of CLR (Calcium, Lime, and Rust) to clean copper surfaces. CLR is a well-known cleaning product designed to remove various types of deposits, including calcium, lime, and rust, from a range of surfaces and appliances.

**Step 1: Understanding CLR and Its Composition**
CLR is a powerful cleaning agent that contains a combination of chemicals that work to dissolve and remove mineral deposits, rust, and other forms of buildup. It is commonly used for cleaning HVAC systems, swamp coolers, tools, humidifiers, and dehumidifiers. The formulation of CLR is designed to be effective against hard water stains and other mineral-based deposits.

**Step 2: Safety and Compatibility with Materials**
It is essential to consider the safety and compatibility of CLR with different materials when deciding to use it for cleaning. According to the product information, CLR is safe for use on all PVC materials and is also septic safe. This indicates that it can be used in plumbing systems without causing harm to PVC pipes or septic systems.

Step 3: Contraindications for CLR Use
However, there are certain materials and surfaces that CLR is not recommended for. The product information clearly states that CLR should not be used on painted surfaces, colored grout, aluminum, etched glass, Formica, natural stone, brass, or other certain metals. This is a crucial point to consider, as using CLR on these surfaces can cause damage or discoloration.

Step 4: CLR and Copper
Now, coming to the question of using CLR on copper surfaces, it is important to note the caution against using it on brass, which is an alloy that contains copper. The similarity in composition between brass and copper suggests that CLR may also not be suitable for cleaning pure copper surfaces. The potential for damage or discoloration is a significant concern when considering the use of CLR on copper.

**Step 5: Alternative Cleaning Methods for Copper**
Given the potential risks associated with using CLR on copper, it is advisable to explore alternative cleaning methods. Copper can be cleaned using a variety of methods, including the use of vinegar, baking soda, or specialized copper cleaners that are designed to be safe for this material. These alternatives are less likely to cause damage and are more suitable for maintaining the integrity and appearance of copper surfaces.

Step 6: Precautions and Recommendations
Before using any cleaning agent, it is always recommended to read the product label and follow the manufacturer's instructions carefully. If you are unsure about the compatibility of a cleaning agent with a specific material, it is best to perform a small test on an inconspicuous area before applying it to the entire surface. Additionally, wearing protective gear such as gloves and eye protection is essential when handling chemical cleaning agents.

Step 7: Conclusion
In conclusion, while CLR is an effective cleaning agent for a variety of applications, it is not recommended for use on copper surfaces due to the potential for damage. It is always best to opt for cleaning methods and products that are specifically designed for the material at hand to ensure the best results and to prevent any unintended harm.

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CLR will clean HVAC, swamp coolers, tools and humidifiers as well as dehumidifiers. ... CLR is safe on all PVC as well as copper plumbing and septic safe. CLR is not recommended for use on painted surfaces, colored grout, aluminum, etched glass, Formica, natural stone, brass, copper or other certain metals.read more >>