Chain
I use a citrus degreaser concentrate and add water to it and soak my chain in it for an hour or so and lube it once it’s on the bike. Not sure why but I do ride my bike daily and need to lube it weekly! Will look into carb cleaner as the degreaser isn’t good for the environment.
I need to look up this method of using a steel ruler as I was going to buy a tool for chain wear. I have made a mistake of taking off a chain because I thought it had surface rust and it meant that it was worn down!