The invention discloses a solid conditioning composition. The consumer product composition comprises a non-porous dissolvable solid structure comprising from about 30% to about 95%, by weight of the consumer product composition, of a carrier material, and from about 5% to about 50%, by weight of the consumer product composition, of a hydrophobic conditioning agent disposed within the carrier material of the non-porous dissolvable solid structure. The carrier material comprises a polyethylene glycol material, or mixtures thereof, having a molecular weight of from about 200 to about 50,000. The hydrophobic conditioning agent is selected from the group consisting of silicone materials, organic conditioning oils, hydrocarbon oils, fatty esters, metathesized unsaturated polyol esters, silane-modified oils, and mixtures thereof. Preferred products are shampoos, hair conditioners, laundry detergents and fabric softeners. Preferably the conditioning agent comprises a silicone or polyisobutene. The conditioning agent is preferably disposed in the carrier as particles having a mean particle size of 2 to 2000 microns. A method of treating a surface comprises dissolving the consumer product composition in an aqueous solution to form an aqueous treatment liquor and contacting the surface with the liquor.