Strip the wire’s coating with a wire stripper. Do not nick the wire.
Squirt some antioxidation grease onto your fingers. It coats the aluminum wiring and prevents oxygen from penetrating.
Rub the wires with your fingers, thickly coating the wire with the grease. Wiping the wires with 240-grit wet-or-dry abrasive paper helps work the grease into the wire.
Attach a UL-approved wire nut connector to any junctions between aluminum and copper wiring. Copper increases aluminum’s oxidation rate when they contact each other. The wire nut connectors are prefilled with antioxidant cream and are specifically designed to prevent oxidation at aluminum and copper junctions.