The present disclosure describes solid compositions comprising a paraffin inhibitor and a corrosion inhibitor. The paraffin inhibitors include polymers having various repeat units containing one or more ester moieties. The corrosion inhibitors can be imidazoline compounds, quaternary ammonium compounds, or a combination thereof. These solid compositions can be used to treat subterranean hydrocarbon-containing reservoir and can inhibit or reduce paraffin deposition in the reservoir and/or inhibit or reduce corrosion in a piece of equipment in contact with the reservoir.