Ah, puzzle mats are lifesavers talaga, kaya importante keep them clean! I just vacuum mine regularly or use a lint roller para sa dust, then for sticky spots I wipe with a damp cloth, some of my mum friends use a bit of mild soap and water, then let it air dry completely bago the kids play on it again. Depende sa material (foam or rubber), pero generally avoid harsh chemicals kasi makakasama sa kids. If sobrang dirty na, pwede ring scrub gently with a soft brush, then rinse at air dry well talaga so it doesn't get moldy!