Q: I have to ask... how do you keep that white grout so white? We recently bought a 30 year old house. It has two bathrooms with white grout. I have tried various cleaners and still have quite a bit of grout that is not white.
A: I struggled with this problem from house to house. No product except bleach will get rid of black mildew. But what about the yellowing stains that result? I have used Grout Whitener (like paint) to hide the yellow areas. I even contemplated removing the grout with a special tool and replacing it with fresh white grout.
Then I read that the Mr. Clean Magic Eraser could clean the yellow stains from old grout. You know what? It works. It is worth $4 in Magic Erasers to get rid of the problem and then prevent its reoccurence with regular tile cleaning products.
My friend Lynnette from the Fun Times Guide has a page chock-full of Mr. Clean Magic Eraser ideas. She also includes links which debunk the myth that formaldehyde is the "magic" in the eraser.