The best replacement for mouthwash is floss.

The best alternatives to mouthwash are rated as following:
★★★★★  floss
★★★★★  flossing
★★★★★  toothpaste
★★★★  brush first
★★★★  hydrogen peroxide
★★★  salt water
★★★  brushing
★★  floss first
★★  mouth rinse
★  rinse
★  fluoride rinse
★  listerine
★  gargle
★  non alcohol mouthwash
★  peroxide
★  oil pulling
  no mouthwash
  trivalent mouthwash
  brushing teeth
  brushing first

Your alternative for mouthwash is not listed? Suggest!
Speaking about mouthwash, one probably shouldn't forget about peroxide.

Other search terms related to mouthwash and their ratings are:

★★★★★ peroxide
chlorine dioxide and zinc
You have in mind a companion for mouthwash and it is not yet here? Propose!

Google Trends

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