Thanks for the reply DavyJones.
Yeah I said to the guard that I didn't realise it was so dirty and I'd wash the jeep when I got back to the site compound but he ignored that.
I might do as you suggest and go to court myself; hopefully I will get a reasonable judge that I can explain the situation to.
At the moment you are up for a dirty number plate.
If you elect to give evidence, I think you can be cross-examined.
Merely stating the sequence of events will expose you to another charge.
You said you didn't have your licence on you when you were stopped by the Garda.
My strong advice to you is to to court, show respect for the judge, take the hit, walk away.
If the judge asks if you have anything to say in mitigation, you can then tell him you had forgotten to hose down the car after leaving the muddy site.
That way the separate and points-attracting offence of having no licence when stopped may not come to the attention of the Court, with possibly adverse consequences for yourself.
HTH