I jus wash mine after i use them then put dubbin on them and put newspaper inside them for them to keep their shape then infront of the fire.
mink oil, saddle soap, leather food, leather conditioner, dont get them too wet. dont stretch them out. clean the dirt or anything thats on them after use. it will help soften the leather and make it last longer
I dont really take as much care of them as i should really but meh theyre football boots not a car or something