water/rust stains on carpeted ceiling in boat
I would say to give OXY Clean a try. Or a HOT steam applicator. One of those two things have worked for me in the past. However whichever of the two that you use, you NEED something to suck the water back out of the carpet. The oxyclean and the steam will only drive the stain through the carpet. So your dyes from the stain will remain underneath.
Hope that helps in some way. I do however like Captain Bruce's response!