Welp, you could always try this stuff. It's a little less chemically than other spot ons.

http://www.onlynaturalpet.com/produc...gs/207000.aspx

For ticks neem oil works fabulously. You can find neem oil sprays. My store has one from Ark Naturals but you can also get the straight essential oil from www.vitacost.com. A word about essential oils though, they should never ever be applied to cats. Can't for the life of me remember why, but I think it just has to do with the licking to groom themselves.