A consumer product composition comprises a non-porous dissolvable solid structure comprising a carrier material and a hydrophobic conditioning agent disposed within the carrier material, wherein the hydrophobic conditioning agent has a viscosity at 25 degreesC of at least about 0.01 Pa-s. Preferred products are shampoos, hair conditioners, laundry detergents and fabric softeners. Preferably the carrier material comprises a polyethylene glycol and 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.