Rusty dry drip on the window.

[davewindowcleaner]

Turn up this morning to clean a newly built warehouse, I notice on one of the window got dry rust drip stain I couldn't remove.

Can anyone recommend the best way to remove this stain

 

[Smurf]

This might work?

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[cheapncheerful]

rust is a bugger...magic sponges are good....and cif jif whatever..