Try the following:
1) an initial rinse, after washing, using distilled water, followed by
2) using some isopropyl alcohol in your Photo-flo + distilled water final rinse.
I mix my final rinse as follows 1 part Photo-flo + 7 parts (70%) isopropyl alcohol + 192 parts water.
The easiest way to do this is to first make up 8 ounces of a "stock" solution of 1 part Photo-flo + 7 parts (70%) isopropyl alcohol (it keeps) and then dilute that stock solution immediately before use - 1 part stock + 24 parts water.