Being a real miser when it comes to dope, I use a set of aluminum measuring spoons to dip the dope out of the can and put it into the mixing jar. I then add thinner to the dope and stir it in with the mixing spoon, which pretty much cleans off the spoon. Then finish by wiping of the spoon with a paper towel with just a bit of thinner on it. When the can of dope gets down to about half empty, I start pouring it from the can, and use my brush to clean the dope out of the groove in the top of the can, wiping the dope off of the brush back into the can. This kind of evolved from my old R/C days of mixing K&B Superpoxy and measuring the paint and catalyst.