Tube stain
Hi has this ever happened to any one ? I left a canvas cover on part of tube and when i removed it there was a huge brown stain i cleaned it best i could but there still was a faint brownish mark, returned next morning and it was gone !! very wierd scared to completly cover rib just in case .i cleaned rib with some cif and silit bang could this couse it to go brown if not rinsed off properly?
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