From my experience, any more pressure on the gauge face than you might get from a light brushing with a used makeup brush, is likely to smear the printing on the gauge face.
I also learned the hard way that a tach needle can break off surprisingly easy.
I would guess that some sort of steam cleaning might work, but the main problem is that the ink used on the gauge face tends to act like pastel (think: soft chalk) - so I cannot stress enough to be careful.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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