Filthy grey waste tap protection

Am seeking an ingenious solution or maybe something simple I haven't thought of ....

Our grey waste drain tap gets covered in road grime and muck which makes emptying  a dirty job. I could use gloves but would rather try a preventive cure to save the tap. I've thought of securing a plastic bag over the tap and am currently thinking of trying to fashion a cover from an appropriately sized plastic bottle/container.

Any other bright ideas/suggestions appreciated.

Fix a flap of rubber , something like an old mud flap in front of the tap fixed to the underside of the van floor if possible

Or just leave it open all the time like some do   Only joking

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12 volt drain valve and switch by drivers seat. I don’t even have to get out just drive over drain and turn on the switch .I did reposition the tap if I did want to use it but no flexible pipe that gives problems

Thanks Guys,
IanH - your suggestion went down like a lead balloon!
Have mud flaps which help but not enough
Like the idea of an electric release but bit of a faff, cost etc and something else to go wrong!
Will continue with my germ of an idea and if it works will let you all know, if not I may be strangely silent....
Thanks all

After this weekend arriving on site hand having a dirty waste tap  my comments have now changed to man up ! It’s a bit of muck you can wash your hands after it’s not going to kill you   the same as I have just had to do

You wanted bright ideas - how about wearing a pair of yellow Marigolds? 

I am not averse to getting my hands mucky doing this job. I am averse to being in that situation with no wash facility available. The same applies to foul waste cassettes where no personal hygeine facility is available at the dump station.
Keith

I feel there is a bit of Q.E.D. here, not keen to use waste tap if no cleaning facilities available, but waste tap is attached to moho which has water, sinks etc to provide hand washing facilities