Hi, I'm Kathy O. from Greenville, SC. Last week I had a power washer company power wash my gutters, front porch, sidewalk and driveway. A couple of hours after power washing, I examined the ceiling of my front porch and noticed yellow streaks over the whole ceiling and trim board. The ceiling and trim board is white vinyl. I believe the power washing team used a bleach solution. How do I get the yellow stains out?? Please advise.