There is so much work being done to preserve Apple II software  and documentation  that we sometimes overlook the value of maintaining hardware, too. But that may be our most precious resource of all; after all, software can be duplicated, manuals can be reproduced, but hardware is unique and something they're not making any more of.
Just this month, two different Apple II users expressed their care and admiration for original hardware by rescuing vintage equipment, painstakingly restoring it — and exhaustively documenting the process in photos.
Kevin Rye of
RescueMyClassicMac.com  AppleToTheCore.me  has saved two peripherals: first, a CH Products joystick ; then, a week later, an Apple IIc external 5.25" floppy drive . Useful to the reader are Kevin's instructions for disassembling each piece of hardware, showing how he took everything apart then put it back together in working order. As for the actual cleaning, some of Kevin's techniques may seem crude but are effective: "I could just just wipe the whole thing down with some alcohol and have at it with some Q-tips, but there's too many little nooks and crannies that are caked with dirt and grime. It needs to be taken apart and washed in the sink. I might even give it a quick dip just to lighten it up a bit." But he does apply alcohol, peroxide, and Retr0bright  where appropriate.
Meanwhile, Mike Maginnis  had the opportunity to restore a full Apple IIc computer . His written documentation doesn't detail disassembly or cleaning techniques, but his photos of the IIc  are brilliant, thorough, and artistic, as you would expect from Mike.
For more details on how to restore your hardware to its original function and appearance, Tony Diaz has given multiple sessions on this topic at KansasFest . You can bring your goods to KFest  for his expert evaluation, or view one of his previous presentations :
(Hat tip to the 68K MLA forum )