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A "new' roll of 3M electrical tape won't leave any residue.

If it's been sitting in a Houston warehouse for 6 months before you bought it - it probably will.

Since there is no 'use by' date on...

Yea, that works... I've been an electrician for 30 years and always found the the tail of my t-shirt also works pretty well... when honing that's the part that cleans up before the look-see and...