I do this, I dip them in a mild bleach solution and then I scrape the part that sits below the puck, I also split the end.
I just made my own cloner with a plastic crate, a hole saw and an aeration stone.
I add some fulvic, kelp and a 1/4 strength dose of nutrients. Sometimes I’ll add a little algacide. I change the water every four days or so, and I get nearly 100% with woody clones. Fleshy clones not as much.