Dilon de Silva

Hi all.... I am a Sri Lankan director who mainly directs TV commercials. When I was shooting a TVC recently I used Fuji Reala 500D stock. When I Processed the stock in Prasad Lab in Chennai india they informed me that the emulsion is not fully get cleaned in the bath even after ultra sonic cleaning. Pls tell me what can I do to get out of this problem. Regards Dilon