It's time again for the on the house tip of the week. What's worse than the drip, drip, drip produced by poor water pressure? It's the gulp, gulp, gulp of a slow drain. Dad's old cliche, "an ounce of prevention is worth a pound of cure" is right on when it comes to drains. Cooking grease, coffee grounds, hair and soap scum are a few of the biggest enemies of a drain. Cooking grease should be saved in an old coffee can or cardboard milk container. Coffee grounds are a welcome addition to a mulch pile. And a majority of hair and soap scum can be caught with a screen or grate. A safe way to clear a clogged drain is to pour a half-cup of salt, a half-cup of baking soda and a half-cup of vinegar down the drain. Follow this concoction with at least two quarts of boiling water. And that's the On The House tip for today.