The best replacement for seafoam is lucas.

The best alternatives to seafoam are rated as following:
★★★★★  lucas
★★★★★  stabil
★★★★  techron
★★★  marvel mystery oil
★★  stp
★★  bg44k
★★  gumout
★  startron
★  lucas fuel treatment
★  b12
★  berryman
★  berryman b12
★  b12 chemtool
★  mmo
★  mystery oil
★  cataclean
★  lucas oil
★  lucas injector cleaner
★  heet
★  mint green
  redline
  44k
  fuel injector cleaner
  auto rx
  diesel kleen
  aqua
  berryman's b-12
  surf green
  crc
  auto-rx
  bg
  lucas oil treatment
  bg 44k
  ring free
  ringfree
  sponge candy

Your alternative for seafoam is not listed? Suggest!
Speaking about seafoam, one probably shouldn't forget about no smoke.

Other search terms related to seafoam and their ratings are:
★★★★★ no smoke
★★ stabil
You have in mind a companion for seafoam and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of seafoam in all years. Click on graph for more.
seafoam
lucas
stabil