Front Discs.....

wouldnt advise using wd40 on your discs and then relying on the heat of use to burn it off as by then it has contaminated your disc pads and its a brake strip and pad friction surface clean with emery tape if your lucky or new pads if your not .if your really unlucky its a long stay in hospital or a body bag .. it would be fuggin suicidal to wd40 your discs and use the scoot even slowly and assume that it will burn off . wd40 is a type of penitrating oil and WILL be absorbed by your brake pads . if you want to clean the marks off your discs use some fine wire wool and it will wipe off nice and easy . freestyler is right in saying if it gets to bad and causes pitting on the discs that this is bad , but cleaning them more frequently while a pain the arse is better than an ambulance ride .
my advice as a mechanic of over 17 years is dont do it .
your call , this forum is dependant on people helping each other out so no offence to freestyler .

take it easy

rich

Just a thought....how about popping small bags around the discs when you know you're not gonna use for a while and drop in a couple of silica gel bags in to absorb any moisture.

A quick rub over the discs with a scotch-brite pad will fix them right up...and won't leave an oily residue to contaminate your pads

Most electric circuit cleaners contain a small amount of oil/grease. Dont use this on your brake discs. If you want to use some spray cleaner, then use normal brake cleaner spray.

I guess the rough kitchen sponge is the best way to clean up the discs....