Whats the norm/average price for a window cleaner?

18 euro, 5 bed semi with patio door front, another side door & 2 patios doors rear. Comes every 4-6 weeks. If we are not in, I text him and make payment arrangements. No bother. Also has a gutter cleaning service. Well worth the money IMHO

Can anyone recommend a window & gutter cleaner in the Dublin 3 area?

Ta