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Best way to clean up a electrical tape

d-limonene is my go-to for that, or http://www.desolvit.co.uk/product/de%e2%80%90solv%e2%80%90it-sticky-stuff-remover/ which you can get everywhere if you don't want to shop for industrial chemicals. The proper solution would have been to avoid adhesive tape in the first place, you can nearly always use a loop of self-amalgamating silicone tape instead.