I'd clean it with some spirit or something that won't leave any residue then touch it up with lacquer, and try to do a good job, remember aluminium corrodes faster than steel so it wants doing quick as well. Things like that wind me up, but at least it would last longer before the corrosion sets in and makes a mess of the wheel
Gonna do this at weekend. Would you rub it down first with fine emery and would you advise brush or spray lacquer? Thanks.
If you rub it first you wat to be using paper which is so fine its smooth (like what they use when they paint cars), alloy wheels are soft stuff you don't want to be gouging them away with rough emery cloth/paper. Maybe even wire wool, but make sure you get it clean before you touch it up and you ideally don't want the edges of the old lacquer to be flakey, as it will soon start t lift up if it can move (remember the brakes heat the wheel and the wheel will expand at a different rate to the lacquer, if its flakey and/or you trap air (which will expand/contract) in there it will soon deteriorate). You don't want to trap anything under the lacquer, id use a small brush or touch up stick, get decent lacquer though you get what you pay for and don't get impatient (i had that trouble with airfix as a kid). Put a few coats on, and check it regularly.
Just to let you you know I've only ever done this to painted wheels before, so without having it cut again it isn't going to look like new and I'm not sure how good it will look but it will help stop/slow the spread of corrosion.
