When I need the very best precision possible, such as Table and Chunk shooting where a rest is involved I use pre-cut strips of material that have been soaked in a solution of Ballistol/ water then laid out flat and allowed to dry overnight, a la-Dutch Schoultz. I should add that for those competitions, I'm using a thicker patch that measures .020" ( compressed) and a .500 ball in my 50 caliber rifles with a solid brass 3/8" Range Rod to load.
For offhand shooting, I just use a (thinner) pre-cut patch, wet with about anything and can't tell much difference.