A mild cleaning solution is fine. I use a mix of 1 oz kodak photo flo, 1 oz isopropanol, and a quart of pure water with old cotton diapers and microfiber cloths.
The heat sink clamp is fine. You can bend it to hold tighter when you reinstall the IC. These sets were relatively reliable with respect to IC failures, so I don't think heat is that big of a deal.
The heat sink clamp is fine. You can bend it to hold tighter when you reinstall the IC. These sets were relatively reliable with respect to IC failures, so I don't think heat is that big of a deal.