1) Hydrocarbon solvents used in dry cleaning can be either saturated or unsaturated. Saturated solvents are safer as they are less likely to produce odors over time. 2) Isoparaffins, or isoalkanes, are the preferred type of hydrocarbon solvent for dry cleaning. They have carbon atoms arranged in branches like a tree. 3) Examples of recommended isoparaffin solvents are EcoSolv fluid, HC-DCFTM Low Flash solvent, and DF-2000. These have low aromatic content and are completely hydrogenated.