I got some dirty 4x5 holders that were not used much and they cleaned up nicely. I used a combination of compressed air (80psi) and a strong shop vac with a brush. I also used q-tip swabs to clean what I could of the channel before the light trap. For the surface and darkslides I used 409 cleaner. I found lacquer thinner would clean everything (including permanent marker) off the white information area without damage to the white area, but it can melt the black plastic so be careful.
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