[Swee'pea]

add washing up liquid to what? the roundup?  :shock:

                                                                                                                 If your using the proper roundup no need to add washing up liquid because its already got a wetting agent in it, but if your using glyphosate then its the same stuff only a lot cheaper but doesnt have a wetting agent  ( this makes the chemical stick to the leaves etc ) this is why you need to add washing up liquid because it does the same as a more expensive wetting agent hope this is usefull

Ahhh......all becomes clear. thanks for the explanation Phil

[peter james]

this is a cheep source of glyphosate this seller has had this listed for about a year so must have a good supply .should be plenty in a tub to last lotty use for years   .LINK .
hope this saves someone some cash as round up is very expensive .... thanks p,j,

[philskin]

If you have got a agricultural supplier in your area they will sell glyphosate 260 in a 5ltr  container , this should retail for about £25.00  making it very cheap if there are a few of you club together and buy it they also do a 1ltr pack but I think it costs about £ 17.00 so works out a little dearer