Hi Clark,

Photo-flo is classified as a “wetting agent” with “very little" activity, at best, as a detergent.   We never found a good reason to include it in any formulation.  But with the right RCM surely you can just suck everything off ….  unfortunately that’s wishful thinking.

It’s usually quite easy to demonstrate this with any RCM.  Clean a side with your favorite wetting agent, play it twice & listen carefully on the third play back.  Then repeat with the addition of a suitable water soluble surfactant.  

If you feel the need, reverse the process.

It’s an interesting observation that a number of KM owners I’ve talked with seem to believe that the focused vacuum & just about any fluid will do.  Unfortunately this simply is not the case.  It has been our experience & that of our various testers that thorough cleaning with an effective detergent was necessary for consistent, high quality cleaning which includes removal of the mold-release agents. 
A substance that reduces the surface tension of water or another liquid, causing the liquid to spread across or penetrate more easily the surface of a solid.

detergent:  a water-soluble cleansing agent that combines with impurities and dirt to make them more soluble and differs from soap in not forming a scum with the salts in hard water.  Some detergents have both properties to varying degrees.  

We chose to use a mixture of a high purity surfactant blend coupled with a small but critical amount of I-propanol.  The is not isopropyl alcohol.  Extensive evaluations confirmed the safety & effectiveness of this approach which was further confirmed by listening evaluations over a period of years from a larger number of interested testers.

First the doubters claimed it was all BS & then they listened to the results ….  then they said you could never use the same solution on vinyl & shellac & they realized they were mistaken; ask the folks at LOC or a variety of respected universities & archives; finally we demonstrated that we could also thoroughly & safely clean Edison diamond discs.  If you want confirmation call the Edison Historical Site as well as the remarks volunteered by the head of Yale’s Historical Sound Archive at the ARSC meeting in Nashville in the early 1990s. 


Duane Goldman

H D Goldman Lagniappe Chemicals Ltd. 
PO Box 37066 St. Louis, MO 63141 USA
v/f 314 205 1388  [log in to unmask]

On Jan 18, 2016, at 6:24 PM, Clark Johnsen <[log in to unmask]> wrote:
> Hi Duane.
> Aren't Photo-Flo and Dawn redundant?
> c