This is one of the rituals which seems to work reliably =) My arm has been a little bit sore, but not itching. And it is quickly getting better. However, the same never works with nettles, yet I'm stupid or careless enough to re-try it each summer, just ignoring the nettles and hoping that it won't be that bad - but sometimes that leads to unpleasant itching, which gets worse when it would be time to sleep... Oh well, but maybe this summer I remember to pay a little bit more attention to nettles before my skin gets burned with their acids.