Maybe you could reconstitute them some by soaking for an hour or so before each use?
And it seems to me that unless organic, you really won't be able to rinse them too easily. I feed fresh, but I see my pancakes and baby sulcata eat dried leftover weeds in their enclosure often.
Lol...now that would have been a fun conversation to have witnessed....lol...or the police..no sir, not what it looks like..it is dandelion greens for my tortoise....lol