Windex should work.
Disclaimer: Windex is my go to for cleaning up Vallejo boo-boo's and stripping same. But this is always a risky operation since there is almost always some sort of base coat under Vallejo. You should be ok with the lacquer clear coat underneath, if you let it cure long enough, etc. But no guarantees, ok?
EDIT:
I've been thinking, and I've never used Windex over a layer of lacquer to strip Vallejo. Since Vallejo is water-soluble, I am wondering if it might be safer to try a bit of water first.
Sorry, I shouldn't be giving advice for something I don't have first hand experience with. And stipping Vallejo with Windex is not the same as stipping Vallejo with Windex over a coat of lacquer. I've done the former several times, never the latter.
Maybe somebody would know for absolute sure. I think whatever you do sooner is probably better than later, the longer any Acrylic cures, the tougher it gets.