Old t-shirt pieces - there is more dust and lint floating around in the air / environment than in the cloth.
Always be aware as to how you store or dispose of your used finishing-cloth...
You can also brush it on ... light / thin coat(s).
G.
Might also check at Home Hardware for their Lint Free Rags. Not sure if they still have them but they used to come in 10lb bags for about $10.00 a bag.
Joann Fabrics long time ago bought several yards of pure cotton cloth (like T-shirts), washed it a few times and cut it into squares I keep stored in zip-lock bags to keep dust out: supply has lasted years, is clean and lint free. Is my go-to for polishing paint, applying varnishes and polyurethane.