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If they were completely submerged in salt water, then they need to be submerged in distilled/deionized water to flush the salt completely. Then drain, blow out with air, and expose to a low dry heat (100-150 F) til completely dry.
In this way, can you use power tools in the rain?
Do not use electric tools in wet conditions or damp locations unless tool is connected to a ground fault circuit interrupter (GFCI). Do not expose electric power tools to rain or wet conditions; wet tools increase the likelihood of electric shock.
In this regard, what happens when tools are left in the rain?
Even when rain is not in your forecast, tools left outside are exposed to moisture from wet grass and dew. When storing your tools, keep them off the ground so they're not exposed to moisture on your garage or shed floor. If each tool has a space, it's more likely that the tool will get put away after use.
Open the motor and pull the rotor. Remove the bearings, clean the windings and bake-out the stator to remove any residual moisture. Clean off any rust on the surface of the stator and rotor as rust particles can create drag problems. Go back with quality bearings and make chips.