I want to clean a nasty-ass chain and cassette I've never cleaned during the 12 years I've owned the bike. I don't want to buy any new replacement parts.
Do I use a bike-specific degreaser spray and do it like in the video?
https://www.youtube.com/watch?v=3UXdn0QQ1A8Or can I just use some kind of kitchen surface cleaner for hard grease with a toothbrush?
How can I avoid damaging the bearings and other moving parts with either method? Take out the cassette first?