Dora Cemetery Association Bronze grave marker cleaning instructions 1 Remove any leaves or debris lying on top of horizontal markers before cleaning. 2 Clean dirt and grime with water and a nylon brush on large flat areas of the marker. Get in between lettering and decorations with a toothbrush to remove embedded grime. 3 Rinse marker with water and dry with a soft terrycloth towel. 4 Dampen a soft cloth with mineral oil and apply to the surface of the marker (be sure that the mineral oil is only applied to the bronze and not any supporting material). 5 Scrub the marker with a nylon brush, followed up with a clean cloth to remove discoloration as you work across the marker. You may need to apply several applications of the mineral oil as you work. 6 Remove residual oil with a clean cloth, taking special care around the lettering. 7 Finish with a light application of WD-40 or car wax to put a sheen on the marker and protect it from the elements. Periodic re-application of a protectant with a soft cloth is recommended to keep the marker looking bright. Note: You may want verify with other sources whether you want to use WE-40 or a car wax. If you do use these be sure they are only applied to the bronze grave marker and not any other stone that may be supporting it.