Non chemical solution for blight?

I have got a touch of blight on my tomateos in the polytunnell and I seem to remember my Dad using a non chemical treatment for blight that worked well, unfortunatly he is no longer with us so i can't ask him but I know it was washing up liquid mixed with something, does anyone else have any ideas? For some reason milk mixed with washing up liquid springs to mind but I could be just imagining that one! 

10 parts water and 1 part milk is a formula for a fungal spray-whether it works for tomato blight I don't know.

A squirt or washing-up liquid  with water in a spray bottle is a formula for spraying aphids

Add 20 grams of copper sulphate to 35 grams of washing soda to 5 liters of water and stir , this solution is for spraying against pottato blight, but since it is the same virus that cauces it ,it may be the answer .you may need to do more reserch .

Thanks for the help anything is worth a try

Not sure what you mean by chemical free, Lynne?

Copper sulphate is the same as Bordeaux mixture; both are chemicals.

Washing up liquid is made of chemicals too. In fact, so are tomatoes.

Bordeaux mixture seems to be considered "organic" (although I don't think there'e anything organic about copper, which is a mineral) but it  is to be withdrawn from sale to the public soon - next year I think. I used it on my tomatoes at the first signs of blight (at least I think that's what it was) and it does seem to have stopped it progressing.

I'd be interested to hear if anyone has good results with the milk-and-water mixture, as that would be easy, and cheap, and legal.

This may sound stupid-but isn't everything made up of chemicals so is anything truly organic?

I am not a scientist

by chemical free I meant organic I know about Bordeaux mixture, copper sulphate and I know that wahing up liquid has chemicals in it if we are splitting hairs!  I don't  want to start an argument for organinc v non organic  I was hoping for some old fashioned remedy to be honest.

Thank you for your comments

lazy gardener wrote (see)

This may sound stupid-but isn't everything made up of chemicals so is anything truly organic?

I am not a scientist

It's not stupid - you are perfectly right.

But I'm not trying to start an argument about "organic" things, either.

Each to their own

I don't think any of us want an argument, it's not that kind of forum, thank goodness. It's just not always clear what kind of solution someone's looking for when they say "organic" or "no chemicals".

The best solution, of course, would be for the bloomin' rain to stop for a few days, as constant dampness is the worst thing for blight. But not much hope of that at the moment.

I agree Green Magpie it's not been much of a summer so far   maybe now we are into July it will improve but I won't hold my breath