Too late now, but cardboard usually has sulfur in it, like any rubber products, which is a main cause for tarnishing bullion thread.
No need for fancy cleaners, just a little warm water with a tiny touch of Woolite as a surfactant, lightly brushed with a soft toothbrush, then pat dried with a clean cloth, is best.
Some bullion will respond better than others I have found, but one can never expect a spectacular improvement. The gold wire thread is only very lightly gilded and will show a silvering shade with age and wear, concurrent with tarnishing, which is inevitable and cannot be reversed of course. It is the nature of the beast.
CB
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"We seldom learn the true want of what we have till it is discovered that we can have no more." Sam. Johnson
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