I agree with Miss H Telly, I don't think there'd be anything wrong with 2-3 months, might even take that long to get rid of em.
Would you mind telling us what other kinds of products you've tried for the buggies?
I'm not at all surprised that Unyworm is the BEST, I think we've all come to KNOW that anything Uny and Rocky make is top of the line for sure and for certain. ;))