Thank God I'm avionics!
Seriously though, no matter how unpleasant this task is there are standard procedures and safety precautions. The problem is that these take a long time to follow and the pressure to avoid an engineering delay comes out clearly in this post. No-one can force you to take short cuts on this one and health must come first; the safety of ground staff is just as important as the safety of passengers and crew. If one of your colleagues puts only himself at risk that's his business. But in this case, if anyone gets himself infected with Hepetitis then he can infect his co-workers afterwards, it is not simply his own business. Do you have your own cups in the crew room? You do? OK, how about a water fountain? and so on. So, its in everyone's interest to prevent violation of the approved safety precautions.
As far as the safety of vacuum toilets is concerned, they cannot be as hygienic as the old Racasan types as they can never disinfect the contents as effectively. They are based on the concept of using the minimum amount of fluid to dispose of the waste, while isolating the contents from human contact altogether. As we in the business know, the 'isolation from contact' idea is just a load of cr*p.
Finally, a friendly tip. Never shake hands with Racasan Dan the Sanitary Man. He's easy to recognise, he's the guy with green finger nails...
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Through difficulties to the cinema