It seems important.
For example wiping the leads of a component with a tissue moistened in methylated spirit so that it become clean and shiny. Then it can be soldered.
Cleaning mic XLR connectors. With cotton buds and methylated spirit?
Keeping heads of tape recorders clean. With cotton buds and isopropyl alcohol?
Dust and bad connections may be the worst enemy of electronics?
Etc.
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