Unilever's Persil Power launched in 1994 aimed to overtake P&G's Ariel detergent but failed due to inadequate consumer behavior research, particularly in washing practices across different European regions. The product, which contained a manganese catalyst, damaged clothes at high temperatures, leading to negative publicity and a financial loss of 300 million pounds for Unilever. This incident highlighted the need for companies to understand diverse consumer behaviors and adapt their product testing accordingly to prevent brand failure.