How often to check/ clean silkie feet?

hi all, I’m new to silkies or any chickens with feathered feet. Just curious how often everybody picks up their individual birds and checks their feet for mats burrs or caked on chicken poop? I’m assuming they generally have a hard time keeping them clean and I’ve already picked out a bunch of burrs - and had to do a thorough cleaning after one dug up feral cat poop in the sand bath. wishing they made silkies with bare feet.