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The best way to sand a deck is by cleaning it, sanding the boards and stairs with 60- or 80-grit sandpaper, and sanding the railings and posts with 80-grit sandpaper. You should sand in the direction of the wood grain to avoid damaging the timber. When sanding your deck, use medium pressure and aim for an even sand. Pressing too hard with a sander can damage decks, as most are softwoods.

Sandblasting refers to the process of cleaning a surface using compressed air and aggregate. Soda blasting is the gentlest type of this method, but it differs from sandblasting that uses mineral or other aggregate, since sodium bicarbonate breaks apart more easily than other forms of blast media and, therefore, cannot be reused.

Sanding and pressure washing serve different purposes in deck maintenance, so one is not necessarily better than the other. Pressure washing is ideal for annual cleaning to remove dirt, grime, mold, and mildew. Sanding is a deeper restoration method used to smooth rough surfaces, remove an old finish, and prepare the wood for a new coat of stain or paint. The ideal process for refinishing a deck is to first clean it (with a power washer), then sand it, and finally apply the new stain or finish. While cleaning should be done annually, sanding and staining are typically needed only every one to three years.

The disadvantages of sandblasting are noise, mess, and risk. Sandblasters are louder than chainsaws and spread debris on the ground and through the air. Let your neighbors know that you're sandblasting so they can prepare. Sandblasting can damage your property if not done properly, so thoroughly vet any pros you talk to before hiring.