Currently I am working on a phage display project. What I do is I feed caterpillar larva with bait containing phages, and then collecte the larva haemolymph to identify phages which translocate from guts to "blood". Now my problem is during the feeding the caterpillar larva get phage contamination on its cuticle surface. This surface contamination is very hard to get rid of and it contaminates the collected haemolymph sample. Does anyone have some good ideas to get rid of the surface phage contamination after larva feeding on bait without killing the insect?