Answer for Lighten our red cedar ceiling?

Two things have happened; The polyurethane has yellowed over time and the wood has gained a patina. The only way to eliminate both of these is to sand till new wood and refinish. This is a lot of work and most likely wouldn't be practical.

If you decide to sand and refinish all of your wood ceilings, one room at a time is the best way to do it. Also, use a water based poly or acrylic urethane as the finish. These finishes resist yellowing.

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