Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Norman Stewart" 
<normstewart@a...> wrote:
> Excuse the ignorance - I'm just returning to PC board fabrication 
after a
> long absence.  Years ago, when I was using Kepro and Kodak 
photoresists, the
> best way I found to clean a board was with  a chlorinated scouring 
powder
> (Comet comes to mind).  This left a bright, very mildly abraded 
surface that
> had no problem supporting an unbroken film of water, and when 
dried, took
> the liquid photoresist nicely.  Is this completely outdated, or not
> applicable for the toner transfer methods?
> 
> Norm

It's what I use on anything that is not bright and shiny.   My wife 
has some scouring powder in the bathroom and I just use my fingers 
and scrub the board with it.

As you mentioned, when you have full sheeting action, the copper is 
free from oils and such.

I think this is much less abrasive than those green pads.  They are 
often stronger than sandpaper.

Dave