Mine do that too! I taught one of mine to give me kisses though which he seems to love to do straight after licking one of those!! He pratically chases me about kissing me for more! Getting that stuff out of your hair is pretty nasty.....
Hehe! My mare did that when she first had her horselyx! Luckily she's bay not grey! If it's any consolation, the novelty does seem to wear off after a while and they tuck in not quite so much!!
Ahh yes very funny! When I bought my boy one it was summer and I had not realised that in between licking his treat he had been scratching himself and swatting flies...the rest you can imagine....sticky patches of goo all over his chest, sides and tummy...wonderful!!!!!! He also quickly learn't the art of biting chunks out of it rather than licking...so he has not had one since, being a good doer native!
LOL! They make them about 5 miles from me - I love the tubs for jumping, although they usually get borrowed to make sheep troughs, but they are very sticky!