Please help me with some suggestions and possibly grow a back bone 
My neighbours are outside currently pressure washing their drive. They do this frequently, at least every few months.
This in itself is not a problem, but the drive is shared and the mud and debris floods our side and down onto our patio and under the garage door (where we keep all our outdoor electrics and tools)
Everytime they do a wash, we spend ages cleaning out the flooded garage and all the rubbish off the patio.
I dont know how to approach or fix it, the drive is angled downwards and the drain at the end of the drive cant handle that much water in one burst, so floods a few inches into the garage.
Aibu to ask the neighbour to do this in small stages? I think I need to invest in sandbags. I hate getting this frustrated over a pressure washer, but it floods our garage that is on the end of the drive.
Generally they are lovely, but seem obvious to the hours of work they cause us in clean ups after each wash.