Very hot soapy water if they are reallllly dirty, very hot water with vinegar if it's just normal kind of dirt & smearing. The trick is to have the water HOT, also if you can get one of those glass things which scrapes the water off (I can't think what they are called ) I am a big fan of vinegar for most cleaning stuff
Thanks for the replies - I tried windex (and always use newspaper with it) but it didn't seem to clean them... might give the vinegar and hot water a go, thanks jasp!
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