Repellant/repellent, is that the question?
Repellent
Main Entry: 1re·pel·lent
Variant(s): also re·pel·lant \ri-ˈpe-lənt
Function: adjective
Etymology: Latin repellent-, repellens, present participle of repellere
Date: 1643
1 : serving or tending to drive away or ward off ?often used in combination
2 : arousing aversion or disgust
Merriam-Webster dictionary - on a related note I find it very annoying that the OED is not free online.