My favourite is a polydisc, removal of panel material is virtually zero and they are so quick!! They are unbeatable on flat panels for paint and light/medium rust. For heavier corrosion with evidence of material having been eaten away then the zip wheel favoured by lancialulu is probably the best bet. For more detailed areas and in the folds of panes I use circular wire brushes in an electric drill. There are many shapes and sizes of these brushes and it is just a matter of choosing the most appropriate one. They have the advantage of being smaller in diameter than a zip wheel which is usually around 115mm, being in a drill they have a lower speed of rotation, say up to 2000rpm compared with up to 15000rpm for an angle grinder and thus are easier to control are far far more forgiving when you inevitably catch the brush on an edge!!!!
Have a look here for polydiscs:-
https://www.google.co.uk/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=poly%20abrasive%20disc Andy
PS Storage once cleaned, not the bathroom or kitchen, but the bedroom, lounge, airing cupboard are all ok. Just make sure you have the tacit agreement of household management!!!