The issue with moth balls might be the residual odor. I suppose it depends on brand and the quantity of naphtha. We have used dryer sheets the past two years and one product left quite a odor for at least part of the summer.
Paul and Janet Braun
2003 Toyota 4Runner V8 now 2012 Toyota Sequoia V8
Escape 19' 2010 now 2014 Escape 21'