Abstract: Surfactant compositions including end-capped hydrocarbyl polyalkoxylate and/or fatty acid polyalkoxylate and organopolysiloxane having one or more polyoxyalkylene side chains are good immediate and long term spreaders particularly on fibrous hydrophobic synthetic polymeric substrates such as spun-bonded, non-woven materials made e.g. form polyolefins, especially polypropylene, or PET. Particularly useful alkoxylates are of one of the formulae (Ia to Id): R.sup.1 O.(AO.sup.1).sub.n.R.sup.2 (Ia); R.sup.3.CO.sub.2.(AO.sup.1).sub.n.R.sup.2 (Ib); R.sup.14 O.?EO.sub.i.PO.sub.j !.R.sup.15 (Ic); or R.sup.14 O.(AO.sup.2).sub.k.(AO.sup.3).sub.l.(AO.sup.2).sub.m.R.sup.15 (Id), where the various substituents and indices have defined meanings and useful silicones include those of the formula (II): R.sup.4.sub.3 SiO.?R.sup.4.sub.2 SiO!.sub.x.{(R.sup.4 Si?(O.R.sup.5.(AO.sup.2).sub.m.R.sup.6 !O}.sub.y.SiR.sup.4.sub.3, where the various substituents and indices have defined meanings.