I agree with Gundogs and chaumsong. I too hate HATE using anything, but on the dogs which are really prone to them (longer hair) I haven't found anything natural that works.
STILL - every year, I try the natural products, I won't give up on them

I've been giving Billy No Mates herbs for about 2 months now to my hairy beast - it takes a while to build up in the dog's system and perhaps I just haven't started it early enough on previous years. I also spray with Wondercide, which is a natural product - you can google it.
When I get to May/June and I can't hack finding and removing them any longer (usually I find one engorged one which has dropped off inside the house and freak out) then the last 3 years I've been giving Bravecto. I only need to give one tablet in about May and it sees us right through the tick season till next year so I see this as quite minimal.
I hate to do this, and I've read the research on it and the horror stories - but any collar or spot-on affects not only the dog concerned, but everyone else in the house and I'm just so reluctant to expose us all to pesticides. If I did use anything else, it would be the Scalibor collar. That's what I use when we go abroad. So far, my dog has been fine on Bravecto. She is only just into the 'biggest' dog category (the box with the GSD on the front!), so this year (if natural products fail again) I am experimentally giving her the next size down - (the box with the springer on the front!) to try to at least reduce the dosage and see if that is as effective as the higher dose. It's something I can do, at least, if I can reduce the dose.