I have just taken delivery of a new van and in both the shower and the wash basin there is a label telling me to wash the said items down with warm soapy water after use, and of course an ad for Thetford bathroom cleaner. I know that when/if I attempt to remove these unsightly labels there will be an ugly mark remaining. Any suggestions about how to get rid of the marks without damaging the surfaces? Someone told me that silvo polish was good for getting rid of sticky marks. Any thoughts?