Decided I'd give one of these a clean the other evening. Stripped it down and gave it a shot of carb cleaner and tooth brush. It improved it but not close to where I would like it to be. Do people soak these in diesel or petrol to remove gunk or whats the story? Also is the little sensor built into the body removable? Have the plastic off to expose it and it looks like a little clip holds it in but unsure. Have pics that I can post later. Thanks