I was horrified when Wisk was discontinued – have been using it as long as I can remember due to sensitive skin. I can’t fathom why they took it off the market, especially since you say that Persil is not a similar product (I didn’t try the Persil on principle because I was annoyed with the company for discontinuing Wisk).
I recently switched to the Tide free and clear and have been fine so far.
I have also emailed Persil asking them to bring back Wisk if you want to do so as well. http://www.persilproclean.com/us/en/meta/footer/contact-us.html