Metal zip stuck completely shut. Tips?

in fact l use WD40 for many things...one whcih l was reminded of this morninga smy curtains were sluggish on opeening....spray a small amount on a kitchen roll and wipe the curtain rail a few times...then the tracks run smoothly again!

in fact anything that is rusted over, crusted brown and orange comes up a treat with it...l just rescued a clothes rail fromt he barn, that my husband wanted to throw out, and l washed it down then sprayed it outside and left it a few days, and really wiped it all off..and its all clean again.brown but useable again.
 
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