I bought myself a new (bigger) plastic container for holding water for water changes (i.e. I have a pump to pump the water from it into the tanks)… I was looking for something sturdy and most of all I wanted something square and this was just perfect – except the product & bar code sticker was on the inside. I got most of it off clean but I CAN NOT get the remainder of the sticky stuff off. I’ve tried everything safe that I can think of: rubbing with salt, peroxide, vinegar, straight Prime, etc. etc. Actually, the Prime with salt worked pretty good, but in the end it’s still sticky feeling. What can I use to solvent this off?