Solvent composition and process for cleaning contaminated industrial equipment

A method of decontaminating a vessel during a refinement process of crude oil and natural gas, comprising:

• providing a solvent composition comprising an amine oxide, polydimethylsiloxane in an amount of about 1 ppm to 100 ppm, and water;
• injecting the solvent composition into the vessel using a steam line comprising steam, wherein the steam is saturated steam at a pressure of about 50 psi to about 200 psi and wherein the step of introducing the solvent composition into the vessel comprises a liquid boilout;
• allowing the solvent composition to contact at least a portion of contaminants present in the vessel, wherein the contact forms emulsions comprising trapped gas molecules that are destabilized by the polydimethylsiloxane;
• and
• discharging the solvent composition from the vessel,
• wherein the contaminants comprise a hydrocarbon, hydrogen sulfide, a metal sulfide, or combinations thereof.