[Aunt Sally]

Quite likely.

Chempack softsoap

http://www.gardendirect.co.uk/soft-soap-p-346?zenid=6t6lcntajphbi8djbmfa4nusg4

[arugula]

Thanks Aunty! Gosh but that's dear compared to the horsey one! 

[Aunt Sally]

Do you know what the horsey one is ?  Can you give a link ?

[arugula]

Do you know what the horsey one is ?  Can you give a link ?

Not there now, I'll have a look tomorrow and get back to you. One thought I had, was that it might be weaker in some way than the horticultural one....

[arugula]

Its more than likely this one from Trilanco which we're doing for about £18.50, but seems to be obtainable cheaper than that online.

[Aunt Sally]

That looks about the same and is about  half to two thirds the price (roughly), economy of scale I guess.

500g will make up 25 litres of 2% spray which is more than I'd use in a year.

3 kg would last for ages but excellent for a group purchase.

[bluelou]

I used washing up liquid and water spray on the whitefly but they keep on coming back, my poor basil plant had to go to bin heaven.

[Livinhope]

I only use Fairy as that's what the OH keeps next to the kitchen sink.  The only thing I use it for is keeping the bugs at bay, does it have another use?

Washing up? 

[arugula]

That looks about the same and is about  half to two thirds the price (roughly), economy of scale I guess.

500g will make up 25 litres of 2% spray which is more than I'd use in a year.

3 kg would last for ages but excellent for a group purchase.

Its too big a container for me to buy, Aunty.

[Bernard]

I give it the works - a few drops of washing up liquid but because this is a detergent not a soap I also add some 'real' old-fashioned hand soap (which will leave a residue when it dries) and to give it a kick, a little washing machine liquid.

But I have not made a careful note of what is affected by it either in terms of the pests or the plants.