I wouldn't use wd40, just use the ipa spray and leave it. wd40 is a solvent, with silicon in there. Silicon as we all know is inorganic. it actualy gets rid of dirt, but also drives out oil and anything else thats there, not sure what it does to rubber seals either. wd40 also leaves an awfull slimy greasy residue. this in turn will let dirt etc stay around easier. (like when you soill fuel on the chassis when running the car. Ipa is an organic solvent it does not attack anything and actually "wets" the rubber and keeps it supple/ rubbery, rather than drying it out. because ipa is 99.9% pure it leaves no residue. We however clean our full cars after every bash. (usually need to rebuild it anyway) the electric engine cleaner is essentialy ipa. may have other things in there. it should be ok though. ask you LHS. i just hate paying through the nose for stuff at our LHS. so find stuff else where. RS compnents and maplin are usually cheaper