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For gallium-based liquid-metal residue on a copper CPU cold plate, Thermal Grizzly TG Metal Polish & Restore (TG-MPR-01) is the clearest product match: its maker specifically describes it for gallium residue on copper PC-hardware surfaces. For ordinary dried thermal paste, use gentle cleaning with isopropyl alcohol instead of polishing compound. If your goal is to flatten a cold plate, that is lapping—a separate, material-removing process, not routine cleaning.
Choose a compound by the residue or job
| What you are dealing with | What to use | Important distinction |
|---|---|---|
| Ordinary thermal paste or pad residue | Gentle cleaning with an anti-static wiper and isopropyl alcohol, following the TIM maker’s instructions | Cleaning, not polishing |
| Gallium-based liquid-metal residue on copper PC hardware | Thermal Grizzly TG Metal Polish & Restore | Manufacturer-positioned for this use; not independently compared against other compounds |
| Copper tarnish or a desire to polish metal | A copper-compatible polish may be suitable, but copper compatibility alone does not establish suitability for a CPU cold plate | Check for abrasive action and residue; remove remaining polish as directed before reassembly |
| Changing or correcting plate flatness | Lapping, with an appropriate process and careful assessment of risk | Removes material and can alter geometry; it is not cosmetic polishing |
For gallium residue: TG Metal Polish & Restore
Thermal Grizzly describes TG Metal Polish & Restore, model TG-MPR-01, as a polishing paste optimized for removing gallium residue. The manufacturer says it is suitable for copper, brass, chrome, and nickel surfaces in PC hardware, and lists CPU dies and heatspreaders among its uses. It describes the paste as combining controlled abrasiveness with surfactant technology intended to bind gallium and help prevent it from re-adhering during cleaning. The set includes a polishing pen and lint-free cloths.
These are manufacturer claims, not the result of an independent head-to-head test on CPU cold plates. Follow the product instructions and clean away all polish residue before applying liquid metal again. Thermal Grizzly says to clean until no residue remains, for example with its cleaning wipes or isopropyl alcohol. This product is a targeted option for gallium residue, not a requirement for routine repasting.
For ordinary thermal paste: clean, do not polish
Intel’s TIM removal and application guidance, last reviewed January 30, 2025, recommends a delicate anti-static task wiper and isopropyl alcohol. Wipe gently, let the alcohol dry, and apply fresh thermal-interface material when reinstalling the processor or heatsink. Do not apply new TIM over old material. Intel’s procedure does not call for metal polish or sanding.
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Arctic Silver describes ArctiClean as a two-step product for removing thermal grease or pads and preparing copper or aluminum surfaces. It is a cleaner and surface purifier, not evidence of a polishing or flattening compound for CPU cold plates.
For tarnish or other copper-compatible abrasives
Kemet says its Sabre aluminium oxide abrasive paste is suitable for lapping and polishing and is particularly effective for smoothing soft metals such as copper. Kemet also describes Simichrome as a general polish for uncoated copper and other metals that leaves a protective film. Those descriptions establish supplier-stated metal uses, not testing or instructions for CPU cold plates.
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Before using any general-purpose polish on a cooler, consider whether its abrasives remove material and whether it leaves a film or particles. Follow the product’s own instructions for cleanup, and do not reassemble the cooler until polish residue has been removed appropriately. A compound’s compatibility with copper does not by itself mean it is suitable for contact with thermal paste or liquid metal.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Lapping is not the same as polishing
Polishing can improve appearance or remove residue; lapping deliberately removes material to change a surface. That can affect a cold plate’s geometry, so a reflective finish does not prove the plate is flat, nor does it establish better thermal contact or lower temperatures.
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PACE Technologies’ copper and copper-alloy preparation guidance describes staged abrasives and specialized final-polish approaches for metallographic specimens. It is laboratory sample-preparation guidance, not a cooler-lapping recipe: do not transfer its pressures, chemistry, or sequence wholesale to computer hardware.
FrostyTech’s 1999 Celeron lapping article reported an average temperature improvement of about 18% in its own historical test conditions. That result belongs to its particular processor, equipment, and procedure; it is not a forecast for a modern CPU or cold plate. The available material does not establish a current controlled comparison of polishing compounds on CPU cold plates or support a guaranteed temperature gain.
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