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Howdy used to sing a simplified version of the Colgate Toothpaste jingle. The cast demonstrated Gardol, the invisible shield Colgate coated your teeth with to protect them from tooth decay.
Wonder Bread, then an inferior product that only built strong bodies 8 ways. They later discovered 4 more.
Poll Parrot Shoes.
Ovaltine which gave away (yes, gave away) a plastic Howdy Doody Shakeup Mug.
Three Musketeers candy bars, then with 3 distinct sections, demonstrated by Rex Marshall in a yachting costume.