I'm a cheapskate, and as much as I love Apple and support their products, there's no way I'm getting ripped off and buying iKlear. The amount of times I've heard people say: Don't bother, it's just Spectacle-Cleaning Fluid. So... Can I just use any old glasses cleaning spray on it..? With a nice fibre-whatnow cloth, so it doesn't scratch? I go through glasses at about the same rate as people go through t-shirts, so I'm in no shortage of Lens cleaning fluid. But if not, is there another alternative? Not brand names and stuff, as I said, I really can't be bothered spending copious amounts of dosh on something I'm only ever going to use twice if that. I heard someone say baking soda somewhere, but my MacBook is my baby apple and there's no way I'm going near it with anything before I know what it'll do. Help...?