The best replacement for retarder is vapor barrier.

The best alternatives to retarder are rated as following:
★★★★★  vapor barrier
★★★★★  intarder
★★★★  exhaust brake
★★★  engine brake
★★  thinner
★  jake brake
★  air barrier
  barrier
  vapour barrier

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Google Trends

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retarder
vapor barrier
intarder