I haven't tried the clear. If I ever find that dewormer is no longer working, THEN and only THEN will I look at other stuff.
I have NO idea how many bottles of dewormer I've gone through, but at the moment, I'm using one and have 3 or 4 in my herb box ... when MH has a special, I get a couple more.
After 2 yrs on the Dewormer, in January, I passed what must have been a mother of liver flukes. It was over 2 inches long and just as big around. I had recently passed a few very old gallstones that it must have been hiding behind. Dewormer and Plzchuckle's Hot Lemonade flush was all it took to get it out of there!