Demon Tape

This fucker.

Extremely strong doublesided tape that warrants it's own wiki page. Do not use overly long strips of it. If you use this on a wall, it will take the paint with it when it comes off. You do not need a lot of this. Do not place pieces of it at all 4 corners of an object. They should be more towards the centre of the object so that the object can be twisted to easily remove. Use as little as possible.

It will generally come off residue free, but using large amounts of it will leave bits behind that are a pain in the ass to get off.

It's strong as fuck and can probably hold up to 30 pounds when enough of it is used. If you're affixing anything under 2lbs (sheer or to the bottom of a surface) you should only need 1-3 pieces of 1"x1".

If residue remains, use a razor or credit card to scrape it off. It can take a while.