Perfume in liquid detergent

Hello all....
Im manufacture liquid detergent.. 
But some of my customer complain about the fragrance of my product.. Problem is Perfume not last long. Its fading after completing the washing process.. Actualy they expect fragrance last long for two three days. 
What can i do??
Im adding 0.5% to 0.7% of fragrance to total volume..
Eg :- im add 500-700 ml of Perfume into a hundred liter liquid batch..

Is there any ingredients to improve the Perfomance of Perfume??
Which kind of Perfume is better for liquid detergent??
Is there any sugestion for long lasting Perfume available in india?? 


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