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Sometime ago, I discovered something similar but with vegs, particularly cucumbers.
I had inspected a cucumber and didn't find anything unusual or any parasites. I put it in a vinegar water solution to soak. After 10 mins I saw a couple of long white stringy things in the water when I pour it out. I found this rather curious and did this a few more times with other cucumbers, same occurrance! I concluded that although I couldn't see any parasites on the cucumbers, long worms exists on them. As a protective measure they are probably clear looking, camouflaging themselves on the vegs, but when dead they appear milky white in color.