Max Baer junior who played Jethro on "The Beverly Hillbillies" television program was born this day in 1937. When the Clampett family moved to Beverly Hills, their new home was elegant and sparkling with lots of rich marble everywhere -- on floors, stairways, tabletops, counters, and walls. But soon, it began showing wear and tear with nasty stains everywhere. Why did this occur? Isn't stone supposed to be tough? It is, but, as the Clampetts soon discovered, marble isn't stone, but petrified calcium -- better known as old seashells. Thus it is highly porous and is easily stained and damaged. Here's a neat trick for cleaning stained marble: To remove things (like Jethro's spilled orange juice, Ellie Mae's berry-pie filling, critter tracks and granny's possum stew), here's all you've got to do: Take half a lemon, dip it in table salt and rub the stain vigorously. It's amazing how well it works. And that's the On The House tip for today.