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How to remove stains Jfrom concrete patios Wear heavy rubber gloves and protect eyes and skin when Rust stains can be removed using oxalic acid crystals to satâ€" uration in hot water. Scrub as above, allow to stand for an hour or so until you notice that the stains have disappeared and rinse. In localities where sale of TSP is banned, such as Wisconsin, you will have to subâ€" stitute another detergent such as Savogran‘s TSPPF or Bondex‘s Heavy Duty Cleaner All Purpose TSP Substitute. Let stand for half an hour and rinse with your garden hose. A. You can remove most stains such as oil, grease and air pollution by sprinkling TSP crystals on the area to be treatâ€" ed, sprinkling hot water on the crystals and scrubbing with a stiff scrub brush on a long hanâ€" dle for convenience. We intend to have it leveled next year. â€" Waukesha, Wis. How can we safely clean it? We have tried a few things we had around the house but withâ€" out luck. Q. Our concrete patio has become very dirty â€" blackish looking. There are also a few rust spots on it. By HENRI DE MARNE Special to the Oakville Beaver The solution is to increase the flare of the drip edge with a hand held metal brake such as the one made by Viseâ€"Grip or to install another piece of metal with a greater flare under it or the roofing. If they are caused by rain water running back under the bottom edge of the metal roof protruding from the house and running down the fascia boards, the fix is relatively simple. There should be a metal drip edge under the metal roof panels that overlaps the top of the fasâ€" cia boards. sometimes, the flare at the bottom of the drip edge is not sufficient to shed water clear of the wood. Or it may be that this drip edge was omitted. A. The stains that are clearly visible on the photos you sent may be caused by one of two things. Last year, we had the wood sanded and reâ€"coated with Clear Wood Finish and Thompson‘s Water Seal but this is still not solving the problem. I hope you can suggest a solution. â€" Stowe, Vt. These lines get wider and darker with time. Q. The cedar boards under the bottom edge of our metal roof get black stain streaks from the metal roof. using these potent chemicals. (Henri de Marne, a remodelâ€" ing contractor in Washington, D.C., for many years, is now a housing consultant and presiâ€" dent of Henri de Marne Associates Inc. Send questions to him in care of this newspaper. Those of general interest will be answered in this column.) Copyright 1993, United Feature Syndicate, Inc. Try again, using a quick dryâ€" ing primer/sealer like Znisser‘s Bulls Eye 1â€"2â€"3 or another top grade primer/sealer from one of the better paint companies like Moore, Glidden, Pittsburgh, Sherwinâ€"Williams, etc. A. There may be several reaâ€" sons why this happened. Applying a sealer was the right thing to do and it‘s surprising it didn‘t work. The same thing happened. I put a sealer on it and painted again. It still looks the same. I have been told the surface must be porous. Is there any way I can make it look even? â€" Toronto, Ontario But if the stains are caused by condensation under the metal roof, you have a much more difâ€" ficult and potentially serious problem that is too involved to discuss fully in this space. Q. After I painted my hall walls with good latex paint, it looked like I missed quite a few spots so I put on a second coat. POSTER FRAMING $35" 136â€"B Lakeshore Rd., W., Oakville 849â€"8104 WE HAVE CHANGED OUR NAME BUT NOTHING ELSE Emerald Vista Landscaping RESIDENTIAL AND OFFICE INTERIORS FROM PLANNING TO COLOURS TO FURNITURE SELECTION CUSTOM DESIGN TOOI GIVE SUSAN A CALL TODAY AND SET UP CONSULTATION sUSAN BURNSIDE INTERIOR DESIGN CONSULTANTS (a16) 7 O 2 â€"8 7 35 ( Up to 24" X 36")