pop to B&Q and get a decorating pole ( harris is the brand )
go the sweeping brush isle and get a lightweight sweeping brush
go to the Hose section, buy 10 M of hozelock micro irrigation pipe ( its 6 mm )
stay in the same section and get a pack of hozelock micro irrigation jets
still in the same section, get a pack of hozelock micro irrigation T pieces
once again in the same section, a hozelock micro irrigation to hozelock hosepipe connection
now if you do not have a hosepipe in your garden ( or the customer doesnt either ) then you wil need to buy some hose
go home and drill 2 holes into brushhead, the holes need to be a tight fit for the jets to push into ( pop a spot of superglue into the brush hole to make sure they stay put )
attach brush head to harris pole
attach hozelock micro irrigation pipe to jets and T connection
go to customer house and earn money