Is squash lemon flavoured? If so, yeah, it would have the same effects. If you do keeping drinking lots of Pepsi Max, drinking it with a straw helps minimise contact with teeth. And rinsing with water afterwards. It's more the chemicals that worry me- have you read any of Jillian Micheals books? (She believes that we muck up our metabolisms with chemicals- both in things like Pepsi Max, and protien bars etc, and in unclean foods-non organic foods.)