You only need two things: WD40 and Duct Tape and WD40. Duct Tape to fix things that are loose and WD40 to release things that are stuck.
By the way: the story that WD40 would help against arthrithis is officially contradicted by the factory and in medical forums. The stuff is again very good for cleaning the hands, but that intense skin contact is also discouraged by the factory.
And: Always be careful when using: WD40 is flammable