If it gets to the point that you think you may need shampoo then shave it off. Theres nothing more unattractive than ZZtopesque facial hair. In fact its making me sick thinking about it so imagine what its going to do to your love life. A goatee is stylish but should be kept short, seriously if its long enough to shampoo get rid. If you dont believe me go up to some women and ask them for a blow job whilst you have a long beard, I'm sure they will slap the hell out of you and you would deserve it for looking like a rapist, you know rapists have beards and long coats so you cant wear a long coat unless you want to look like a rapist or even worse, if you stand near a playground you will look like a peadophille! No, IMO beards are best rid, I mean what are you trying to hide exactly?
Equally Cursed and Blessed.