Hand wash...all the way. Usually you can get most of the paint off at the field itself if you bring a microfiber towel. Once home just get a wet towel or completely submerge it in warm soapy water and scrub lightly.
Mask though, you shouldn't need to "wash" it. Just remove your lens and and frames and wipe away the paint. The plastic portions of the mask you can soak but it's pointless IMHO.