HP-67 - need help to remove cleaning residue

[PANAMATIK]

(02-29-2016 08:04 PM)Geoff Quickfall Wrote:  I would hold off on the liquid gold. It does contain natural oils which are also solvents especially if left on to long.

The reason some people have success is that the lacquer finish is still intact, or the family of calcs they are restoring have a robust finish. Woodstocks are notoriously less resilient to cleaning. Coconuts can withstand a lot of physical cleaning and of course the pioneers, voyagers with metal overlays withstand a lot except for sand paper!

I tried Armorall for car plastics and removed the printing on a Woodstock. Stick with soap and water or if you are afraid of diassembly a q-tip and soap and water, not oils, cleaners and etc.

Geoff

I strongly agree to Geoffs advice. Don't use Isopropylalkohol or other solvents. I wiped the PAUSE label off one of my HP-25 some years ago and was shocked about my stupidness. I think you should not share the same experience.

For HP-29C there is at least an overlay available, which restores the printing, but cannot make it original again. I don't have experience with HP-67 because now I'm very careful with cleaning at all.

Bernhard