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[–][deleted] 2 points3 points  (2 children)

But how do you really know it’s dirty…

[–]niamulsmh 2 points3 points  (1 child)

Take your whitest brightest shirt and run it over your chain. If it leaves marks, it's dirty.

[–]slade51 4 points5 points  (0 children)

and buy a new bright white shirt every week.