One thing i'm proving beyond doubt is that WD works as i hoped for what i bought a 5litre pack for.

The alloy wheels on my lorry are plain non coated castings, and they suffer badly from salt corrosion, i keep mine in good condition, polished now and again, and have been experimenting in spraying the wheels in WD40 after i've washed the lorry off properly, wheels dried off, to help prevent salt attack.

Whilst attracting the salt and muck, once pressure washed off the salt hasn't got through to any great extent, so a repeat coating it is.

Don't suppose this is world shattering news, but it might be of interest to those who like to keep ugly metal corrosion at bay under their bonnets, its easily washed off after the winter salt has gone, would be no harm as i can see doing the same as i have to your alloy wheels (worth covering the discs to prevent overspray), especially those diamond cut and laquered types which suffer really badly for the duration of salting.