The testing process will be quite straightforward, using my current oral care regimen with the addition of consistency controls. My twice-a-day process includes:
1) Flossing with a Waterpik oral irrigator using lukewarm water for the duration of a full reservoir, approximately 55 seconds on the highest pressure setting. In addition to being much more consistent than string flossing, the ADHA (not ADA) claims that water flossing is a comparable, if not perfect substitute for traditional flossing.
2) Brushing for a full cycle with a Sonicare ProResults-headed toothbrush. I usually top off after the 2 minute timer expires, but the brush vibrates in 30 second intervals, so I'll be able to consistently go for 2 minutes 30 seconds. My longtime toothpaste of choice is Colgate Total Whitening gel, the only variety that includes triclosan, an antibacterial agent, in addition to the standard active ingredient of sodium flouride. I generally prefer gels to pastes for use with an electric toothbrush due to their higher viscosity.
3) Each of the pictured mouthwashes recommend 10 mL per use and feature spillover caps for accurate measurement. They also recommend rinsing for 60 seconds, which I will time with a wristwatch. One potential complication is that Crest 3D White mouthwash recommends using 15 mL and features a cap without a measurement structure, but I'll cross that bridge when I come to it.
An experiment like this wouldn't be complete without some hypotheses. I traditionally use a whitening mouthwash, but while it may brighten your smile, it doesn't seem to do much, if anything, for your oral health. The blue mouthwash only has sodium flouride, effectively making it "brushing-plus". The green mouthwash has cetylpyridinium chloride, which I'm skeptical is actually effective against plaque. The purple mouthwash has both ingredients, so it's my pre-test favorite, the Crest Pro-Health Complete Rinse.