Simon Harris (Wicklow, Fine Gael) | Oireachtas source

I am delighted Ms Tallon referred to dirty money because of all the allowances, dirty money is the one that most seems like an anti-capitalist term. It is a bizarre name for an allowance.

I do not know whether this allowance is the same as the dirty money allowance applied in the university sector, but I presume it is the money maintenance staff get for what I colloquially call "muck on your boots".