It may be in the eye but it does sound like a PITA.
I'm sure you've tried it all but...

Blepharitis: Symptoms, Treatment, and Prevention

How Do I Prevent Blepharitis?

There are many everyday steps that you can take to prevent blepharitis. This includes:

• Keeping your hands and face clean
• Avoiding rubbing your eyes with dirty fingers or a dirty towel, for example
• Removing all eye makeup before bedtime

If you are in the early stages of treating blepharitis, avoid the use of eye makeup to prevent further irritation. Once you begin using makeup again, replace your products used in or near the eyelids because they may be contaminated.

and no I am not suggesting your hygiene is suspect :P