HP 67 slider switches and trace trouble

[jftman]

Please see the pics. Looks like a break on the on orr side and some partial missing trace along two traces on the run/program side.

How do I clean and grease the switch sliders? To begin the job.
Next I think I would close the on off break with a conductive silver pen carefully and let dry.
But since the other side has some missing but not all, I should not put the liquid silver 'ink' on there?
It would probably get rubbed away.

The calc does not turn on, except a few sparking bits, here and there but very very quickly leave nothing. I wouldn't even call them a segment. More like pin heads ofight.

Do you think the clean break on the on/off side will restore the operation?
Clearly there is rubbing on the left side that needs attention.
That is why I am asking how to clean and lube.....
Oooouch

Update.
Added pic after cleaning trace area with alcohol. Surprise that those breaks were not breaks. I will use Detoxit. What form of grease should I use?