There’s also the Leech Trainer. I have some leech squashing scrips listed on my Study blob.
What I’ve noticed about getting rid of leeches is that it takes time and effort. And some are very persistent. Others, with some working on them, get burned.
So, patience is important.
Good luck! ^>^ You can do it! 
community.wanikani.com/t/ekgs-leech-battle-blog-a-study-log-of-sorts/45850