How do you care for your Dad who is incontinent?

He uses his disposables like an infant. I don't know if he is cleaning himself properly? if he is really messed up he will go have a bath. Many times we smell him before he notices or cares and then we tell him he needs a bath. If he is sitting for awhile in dirty pants, he could get rashes and sores. I am concerned but I don't know how to explain it to him, or how to help him. How do they deal with this in the homes? I am not getting answers. The obvious seems like we would have to do it for him, but not an easy discussion to try and have when he wants to be independent. Any ideas would be appreciated.