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Passive external rewarming is a method used to treat hypothermia by allowing the body to rewarm itself without the application of additional heat sources. In this context, the correct choice relates to techniques that promote this natural rewarming process.

Removing wet clothing helps to prevent further heat loss, since wet clothing draws heat away from the body and can exacerbate hypothermia. Use of blankets provides insulation, which helps to retain the body's heat, aiding in the rewarming process. The application of heat packs, however, is not a passive method; it introduces an external heat source that actively warms the body, rather than allowing the body to generate heat on its own.

Infusing cold saline would counteract any rewarming efforts, as the cold saline would further decrease the body temperature, making it a non-viable option for passive rewarming. Thus, the infusion of cold saline would not contribute to the passive rewarming process at all.