hey so i told my aunt that i needed this empty gallon of milk cleaned very well ( i was gonna use it for doing water changes). I told her not to use any chemicals but she still went on using scented dish cleaning soap stuff. She told me that she washed it in from the inside alot of times after she used it, but im still not sure if its even safe to still use. I went upstairs to my room and washed it another 4-5 times throughly. Should i throw it away or can i still use it?