Here is a strange question for any of the experienced mechanics on this forum: I have several hand pump grease guns. I use them rarely, only at service time at the beginning and end of a season. Every time I pick one up, the grease has liquified, dribbled out, made a mess and is empty. I have tried storing them in the garage, shed and even the basement to no avail. Any suggestions for preventing the mess and waste and recharging the gun every use?