Hi tassie
I picked up some more of the odour kill / detergent cleaner the other day and Mark at Rudd's in Bundall will look after you price wise if you want to try it. Its not that expensive anyway especially at the rates you use it at. Mention the site. First lot I got was a free sample bottle that lasted a fair while anyway.
Apparently they have another odour killer detergent with pyrethrim in it too. I suppose you could use it to clean up insects and jenz (if your slack) and the flies get to it before you clean up.
Cheers
Chimo