Hi 409princess
I read only today in one of the newspapers that you use "Lawn Rescue" from Fito/Gauber. It helps remove the patches and encourages new grass growth.
You apply it as a spray to the affected area.
Must get some myself.
I simply get a watering can full of water and �drown� the area where the dog has wee�d. (Grass can get a bit muddy at times, but at least there�s no brown patches.)
Pets at Home do a Pet and Garden Lawn Rescue, �3.99, which a friend swears by.