Can we use non-vegan products from before being vegan?

[jessvegan.fta]

So yesterday I was making tater tots and thought I had some vegan ranch left. Turns out I didn't, so I just used a leftover dairy ranch packet that we had in the drawer in the fridge from some fast food place. Does that make me not vegan for using a leftover non-vegan product?

 

[Andy_T]

Not using up non vegan products left over from your pre vegan days helps nobody, so it should be fine as long as you don’t buy any more of it …