I'm with Hennie, I don't believe that bass are attracted by the scent but it causes them to hold on that little bit longer, giving me more chance to strike. I always dip my plastics in a clear scent, if the water is discoloured I might use a chartresue or red dip, but just the very tip of the tail. I don't beleive that any bass has ever smelt garlic so prefer the crawfish or gamefish scents.
I use Spike It, mainly because that's the brand that my local tackle shop sells, but I'm pretty sure that they will all work.