I've just done a 3 story terrace front and rear that ring maybe twice a year due to them needing to be home, scheduled with close regular work it was a 15 min £20 job.
Doesn't seem to take me any longer or use any more water than a monthly/6 weekly job.
On a once a year job is it going to take you 12 x as long and 12 x as much water ? Of course not - maybe a reasonable surcharge.
I don't really see what the problem is, maybe if its out of your way or going to take an hour, but a 2 bed bungalow and a small roof ?, come on
, £30 or £35 even but 3 x what she was expecting ? " unbelievable silly price " to whom exactly , you or her ?
each to their own and only my opinion
your choice, feel better now you've vented on here ?