Lucille Ball advertises Lux soap shortly before the I Love Lucy era.   You can listen to an original radio show sponsored by Lux Soap  at

http://www.radioarchives.com/The_Lux_Radio_Theatre_Murder_and_Mayhem_p/ra304d.htm

Look for #589 The Dark Corner Starring Lucille Ball and Mark Stevens originally broadcast on Monday, November 10, 1947 – 60:00 – CBS, sponsored by Lux Soap

and here are some vintage 1940’s soaps just like the soap bar Lucy is seen with in the original Lux ads – these are currently on ebay! click on the pictures below to go to the eBay pages.