The paint under the bonnet is only a base coat (Not lacquered) as stated in the previous post, so it's not as good / hard-wearin' as the outer coat which is lacquered, I know the base can come off if it's rubbed over with white spirits which isn't as harsh as thinners (thinners takes it down to the primer / rust protection very quickly), some of those cleaning agent's can be quite harsh these days

, especially if you're not used to using them (each valeter etc... etc... will have his own brand, that he swears by for whatever reason), so be careful whatever you're using

.