I try and leave them for about 3 hours or so but at least 40 minutes. The longer you leave them the easier the grease will slide off from the grates. 🙂 I also tagged everything so you can find the dawn power wash.
Great, but thats time consuming and if the clients are cheap and you work for Homeaglow its i have clients that book a 3 hour cleaning and there home are packed with dust dirt and grease its sad