I’m indebted to a listener named Barbara for sharing a tip with us on the radio show. She had a shower door with hard-water stains that resisted every effort she made with powered cleansers, bleach containing liquid products and plastic scrubbers. You name it. She finally grabbed a magic eraser, and it worked like a charm. Magic erasers are basically a plastic that in foam form contains millions of microscopic hard-as-glass fine points that grab on to the soil and foreign material. It is basically a super-fine sandpaper. As with all cleaning systems, test it on an out-of-the way spot, as it can sometimes harm delicate or glossy surfaces. Dear Ken: Our 20-year-old house has ceramic-tile kitchen countertops. It’s the small tile, about 1.5-by-3-inch. Where the front edge of the tile meets the top itself, there is always chipping. Is there any type of molding we can put on to hide the chips? — Michelle Answer: Why not try wood? You can remove the front edge of tile and simply glue on a wood strip made for that purpose. The now “raw” edge of the top’s tile may not be straight enough to accept the wood, but you can use a grinding wheel to ease off any tiles that stick out too far. You...