For each of the items collected, control and treated samples were prepared in triplicates to ensure accurate results. 200 mL of blank 1:1 methanol:water solution without prior storage in PC containers or subjected to any of the set experimental conditions was stored in a glass sample bottle. Control samples were prepared by filling each of the different PC containers with appropriate volume of 1:1 methanol:water solution in triplicate depending on the size, and stored at room temperature (~25 °C) for ten days without exposure to the various temperature conditions. Treated samples were prepared by filling three of each brand of the different PC plastic types with appropriate volume of 1:1 methanol:water solution. These three samples belonging to each of the two PC types were each stored in three different laboratory ovens calibrated at 40 °C, 50 °C, and 60 °C respectively for 4 hrs daily after which they were stored in the refrigerator until the next day. This process was repeated for ten consecutive days .