Household

"1001 Cleans a Big, Big Carpet for Less than Half a Crown" — 1001 carpet shampoo, c.1964
"The appliance of science" — Zanussi, 1981, Geers Gross
"Ariston and on and on..."
"Away go troubles down the drain--Roto-Rooter" — 1954 to present.
"Covers The Earth" -- Sherwin Williams paint
"Does exactly what it says on the tin" — Ronseal, late 1980s to present.
"Hands that do dishes can feel soft as your face, with mild green Fairy Liquid"
"HILLYBILLY LIKES YOU!" — Hillybilly Vac Shack
"It Beats - as it Sweeps - as it Cleans" — The Hoover vacuum cleaner, 1926
"It's a lot less bovver than a hover" — Qualcast Concord lawnmowers, 1985, WCRS
"Kills all known germs... dead" — Domestos
previously - "Kills 99% of all known germs... dead" — presumably it got better!
"Kills Bugs Dead" — Raid (insecticide)
"Quick, Henry, the FLIT!" — Flit insecticide
"Not Advertised" No-Ad sunscreen
"Nothings sucks like an Electrolux" — Electrolux
"Put the freshness back" — Shake'n'Vac
"Screw yourself." — IKEA, 2004, Norway. External link: [1]
"Unböring." — IKEA, 2003, Canada.
"You don't have to be rich, just smart." — IKEA, United States
"Ring around the collar" — Wisk Detergent, 1968
"A buck well spent" — Springmaid Sheets, 1948

Personal care

"99.44% Pure" — Ivory soap
"A totally organic experience" (not "orgasmic"!) - Clairol Herbal Essences
"Absolute cleanliness is Godliness!" — Dr. Bronner's Magic Soap
"Because I'm worth it" — L'Oréal
sometimes followed by, "Aren't you?"
superseded by, "Because you're worth it"
"Does She or Doesn't She? ...Only her Hairdresser Knows for Sure" — Clairol hair dye (later often shortened to "Does She or Doesn't She?")
"For those who like the trade rough" — Travis aftershave
"Good Morning! Have You Used Pear's Soap?" — Pear's Soap
"I liked it so much I bought the company." — Remington shavers
"I'm not a doctor, but I play one on t.v." — Vicks cough syrup
"I never knew you had dandruff" — Head & Shoulders shampoo
"Is she or isn't she?" — Harmony hair spray
"It Floats!" — Ivory Soap
"It won't let you down" — Rexona/Sure/Degree anti-perspirant
A slogan used by Rexona in Finland was "There's always space for one who uses Rexona!" This led to many jokes, such as being able to fit an elephant into an car,