I-SCREAMMEDIAi-Scream Numbered Spot Marker - Big-Size 12" (30 cm), Multicolor Set of 10 Pieces, Anti-Slip Rubber with Carry Bag, for PE/Gym Classes, School Activities, Games, Sports Training, Exercise Drills

I ordered three different sizes and chose these large ones. They worked great for our cake walk at a recent carnival. The colors were beautiful, but now they are very dirty. (Lots of kids walking on them.) I suppose I'll have to scrub them by hand unless someone has had success using another method. ?? Please respond if that's you!

These are large enough to sit on and can easily be moved. I like that they can be used outside, as we as inside.