1. The pan supports (black metal ones) on a gas hob: I usually scrub with dishwashing liquid, cleans ok - but not perfectly clean 2. Shower head: we have a hand held shower too. the fixed shower hasn’t been used much. It’s got a bit of stubborn limescale on it (embarrassed!). Will viakal shift it? 3. My oven: We used have someone come in and regularly clean it. That person moved about 6 months ago. I cleaned it twice since then, it’s ok but not spotless. What can make it new again? 4. Paint/plaster on window frames : how to quickly get rid of this?