If it is actually tar and you can't get it off by simply washing I'd say try claybarring it. And I'd recommend just starting over... wash the car down with dawn and then dry it... then start the zainoing process. Right now I have 4 coats on.. tomorrow I'm putting the 5th and probably final coat. 
Sure it takes several days to put on several coats but it's worth it isn't it?
Soon they'll have an additive out that will make it so it dries instantly and you can put multiple coats on at one time.... Sal needs to hurry up and release that before spring.
Sure it takes several days to put on several coats but it's worth it isn't it?
Soon they'll have an additive out that will make it so it dries instantly and you can put multiple coats on at one time.... Sal needs to hurry up and release that before spring.