When I rewaxed mine, I didn't remove any of the old wax. Also, when I wanted to make the finish look a little bit more smooth, I put my coat inside two pillow cases (just doubled it up) and put in on medium in the drier for 15 minutes. Came out way more smooth and finished, as the heat helped even out all the wax. I'd recommend giving that a try. For sure no washing machine, that will ruin it.