I mainly use XCuts non-stick scissors. God Bless whoever invented them, they are wonderful, but even they struggle a little with ez mount. Fortunately I found some magic fluid in a stationery shop - just named 'sticky stuff remover', it comes in a 250ml bottle, for £1.25p. It's made by Banner, and is brilliant - works on those annoying marks left by price tickets as well, in fact it works on just about everything. I keep a bottle in the craft room and one in the kitchen. The best thing is - it has a nice, light, lemony scent, rather than a chemical odour.