You need to get the cleaner into the guts of the rotary switches. You may need to remove the knobs, then the retaining nuts to get in at them. The knobs may have a grub screw securing them, or simply a push fit/pull off. If you do that, set them all to the minimum, or maximum setting first so that it’s easy to get them back together with the pointers in the correct position. If the switches are fully encased, a spray cleaning product might be best.
Alternatively, pick up another timer from eBay. I was browsing there last night and there are some good bargains in darkroom stuff at the moment.
Alex.
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