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Yes, baking soda and vinegar can remove rust from concrete. Vinegar is acidic and can remove rust stains from concrete on its own. Adding baking soda may increase abrasiveness, which could help loosen some of the stain even more when scrubbing the stain. However, a stiff-bristled brush can do the same. 

Annually, or more if located in humid or heavily polluted areas.

Yes, it is advisable to prime a driveway before painting. Primer serves as a preparatory step, promoting better paint adhesion to the surface, enhancing durability, and ensuring a smoother, more even finish. Priming is essential for concrete driveways as they are porous and absorb paint unevenly without proper priming. Skipping this step may result in a less durable and less aesthetically pleasing paint job, requiring more frequent repainting.

Maintaining a driveway depends on its material. For concrete and asphalt, it's best to clean the surface thoroughly twice a year with a stiff broom and a pressure washer to remove accumulated dirt and debris. Sealing the driveway is crucial to protect it from water damage and freeze-thaw cycles. Before applying a sealant, pressure wash the surface to remove any loose sealant, dirt, or stains, as sealing over them will trap them. Any cracks or expansion joints should be filled with a flexible polyurethane caulk or asphalt sealer. In colder climates, use sand instead of salt for de-icing. Sand helps melt snow and ice without accelerating the freeze-thaw process, which can cause cracks.