Re: [Leica] Residue After Cleaning Lens

["Bob Parsons" <bobp@dodo.demon.co.uk>]

Doug,
You could try using a well washed chamois leather. It has a
soft and not so soft side, so be sure to use the soft one.
Chamois seems to have an enormous affinity for removing
thin oily films/residues on lenses. You may find you have to
breath on the lens first.
New leathers sometimes have a yellowish oil in them which
is removeable by washing in liquid detergent. After washing
and drying rub the leather against itself to soften it. It pays to
wear cotton gloves to prevent finger grease from contaminating
the leather, otherwise it puts on as much oil as it takes off!

Although I hesitate to ask this, you are sure the purplish residue
isn't the anti reflection coating after it's been cleaned? 
I'm assuming that every time you wipe the lens the appearance
of the coating changes slightly showing that there is surface
contamination that's being redistributed.
I've found ROR always leaves a residue which can be removed
by breathing on the lens and wiping with a chamois.
.
Bob Parsons

- ----- Original Message ----
> 
> Do any of you have a tried and proven method for removing the purplish
> residue left after cleaning a lens?  I'm finding the new Heliar, in
> particular, impossible to rid of this.  (Is it a special kind of
> exceptionally irritating coating?)  I used ROR, then distilled water --
> ie. my breath -- which usually works.  No go.  I tried Rexton OPTYL-7,
> which is even more benign than ROR.  No go.  Should I try
> Windex?  (The thought makes me cringe.  Although Bill Maxwell seems to
> favor it -- in particular, I think, the blue stuff.  Or perhaps the
> clear... I forget.)
> 
> I do have a light touch, and have never scratched a lens, but I don't want
> to over-clean this.  Should I just leave the residue?
> 
> Yours in consternation,
> 
> 
> Douglas Cooper
>