Good old WD40. Is there nothing it can't do?
Door squeaking?
No problem, WD-40.
Chewing gum stuck to the carpet?
No worries, WD-40.
Crayon marks? Spanner rusted up? Zipper won't undo?
WD-40. WD-40. WD-40.
It can even waterproof your shoes, I hear.