gpu cleaning

Blow some air on it brah.

If it's pretty old you may also consider re-doing the thermal paste, although that generally takes some disassembling
 
If there's anything you can't blow off with air (although there shouldn't be), isopropyl alcohol is safe to use on electronics too (shoot for minimal water content in the isopropyl alcohol, at least 91% isopropyl alcohol, 99% is preferred).
 
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