Possible Clues:

• Old detergent with "sunshine whiteners"
• Unilever laundry soap brand
• Erstwhile detergent brand
• Product once advertised as having Solium
• Sunshine __: old detergent
• Golden Age of Radio detergent brand
• Soap brand mentioned in 'Hair'
• Detergent brand
• Old laundry soap
• Old detergent brand that used to sponsor radio shows