Recessed lighting?

I have recessed lighting contained by my living room & kitchen, and have lately noticed that the outter rings (baffles) on those lights are in a minute yellowish in color, they used to be white. Is this of late age?
I bought my house new, within 1992. My sister has impossible to tell apart issue with her recessed lighting.


Answers:    it its age and bodily driftwood like dust and grease it should verbs of with some formula 409
Do you smoke or anyone else smoke inside? Could be tobacco residue. You can money them out though. It's not that hard.
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