Awesome! You got your mat and have been busy having fun. Now what? The paint has dried and the peeling part was fun for a while, but man, this will take forever!
To clean the little bits off if they dry on the mat, use soapy water or soak it in a sink/tub and scrub off the bits with a sponge that has the scrubby part on the back (Scotch Brite).
Alternatively, packing tape works masterfully! And is super quick.
Check out a video here: