Hey ... so I browsed through this and utters where my first thought. But have you done the test with your vet to see if your worming schedule isn't doing it's job? Also I LOVE Vetroline Shine and Laser Sheen .. they will make the hair sleek and soft and hopefully harder to rub out.
Just a thought- the hand sanitizer will sting if there are any open cuts when you put it on, so I would avoid that if you can.
Lastly use Infusium 23 Shampoo and Conditioner- it works wonders and smells good. I buy it in the people section at Walmart or Target.