New answers tagged cleaning
1
You could just lightly sand it with fine sandpaper and use a damp cloth to wipe off. nothing else.
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Are you planning o repainting it? If so, ignore the residue and don't sand it, you will make the surface MORE smooth and the paint will have LESS adhesion.
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The absence or red or brown corrosion products indicate it is not likely steel. A magnet will end the guessing. It could be steel with an exceptionally thick zinc galvanizing. Or zinc or aluminum die casting. Water will not corrode it significantly. Apparently a brass mail door and a lock that is really good chrome plating, stainless or German Silver ( white ...
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Walk the lawns at night with a bright flashlight. I found two dozen nails missed even by an additional magnetic sweep the next day by the roofer.
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Acid ( vinegar = acetic acid) dissolves aluminum). Caustic ( sodium hydroxide ) dissolves aluminum. Neither one dissolves carbon/ black soot. A mix of vinegar and baking soda depends on the relative amounts. If I wanted to polish aluminum I would use wet/dry silicon carbide sand paper; 400 grit should be enough to remove carbon soot , then finer grades to ...
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I usually do this with a water vacuum:
It's like a normal vacuum cleaner, except there is no filter bag inside, and it can suck water without damaging the motor. Also quite convenient to clean large quantity of sawdust, demolition dust, mud, sand, etc.
In your case the important features are that
It will suck mud out of an irregular surface like concrete. ...
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