I've always had luck with PB blaster.....so, if these results are good, then a little PSF+Acetone will be what I try next time. Pretty large difference for sure.
The acetone is a fairly strong solvent so I can see how it would reduce the surface tension of the PSF and allow it to flow into small surface voids more easily.
Amazing how things make sense after you read about someone else doing it...
Thanks for the post on this Billy!