where are the stains occuring? on older white (steel anyway) bikes it is not uncommon to see a little discoloration near the headset BB and seat post from grease. are the spots near where you bike leans against something?
check with your dealer.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk