arghhhh not sure if this is the right place but I need help....
Ds (11) and dh(40) have a disgusting habit of peeing on the toilet seats and not wiping them after so I go in and either remember to wipe or if it's middle of night end up sitting in it! 
I have tried asking nicely, I have shouted, I have even left post it notes but they still bloody do it!!!!
I have told ds if he can't pee properly he has to sit down to do it but still puddles! Both deny being responsible despite evidence and I am at my wits end....
Help?????