Have taken one that needed cleaning off the rifle and washed it with soap and water. Make sure it is dry good and screw it back together.
This^^. Baby wipes work well for weapons maintenance, I have used them on everything from an M4 to a M2. But if you don't have to improvise, then don't. You've got that nice stock, do it right. Take it off and wash it up in a sink full of warm soapy water, like Dawn or something.