Liquid Chalk Markers - 8 Pack of Neon Chalk Pens - Window Marker Bright Car Pen, Chalkboard Markers for Blackboard, Glass, Signs, 3-in-1 nib : Amazon.co.uk: Stationery & Office Supplies
Simple chalk marker Christmas ideas - uni-ball
8 Neon Chalk Pens – The Future Image
Chalktastic Liquid Chalk Pens - Set of 18 Neon, Washable Chalkboard Pens for School Blackboard, Menu Board, Mirror, Ceramics & Car Window Glass on OnBuy
Freehand patterned rainbow I drew on my window this weekend using chalk marker pens. I love seeing window drawings on my daily walk around the block. : r/CasualUK