It’s not Luke warm m8 even on minimum setting it’s still hot water with 9kw forget all this hose on the ground stuff cooling it down which it does do slightly,mine still comes out nice and hot all 100 out.
Use warm then hot you can see the difference in the depth and speed of the clean,with water over 60 odd degrees on 6-8 weekly stuff you’re just flashing over glass almost to clean it.