Lads, what is the best product to use when sticking pictures and posters to walls? Something that ideally won't leave marks. I'm just thinking of finally doing a bit of light decorating in my tiny rented flat where a blank magnolia wall is a bit of an eyesore. The contract has that "any marks on the walls and we'll charge you for repainting" clause but I suspect these guys might actually enforce that.

I used to use white-tack but back when I was still a student I noticed it left marks. There's a range of competing alternatives but I noticed some variation in the reviews overall.