Question 1. My Wintahoff tow hitch is noisey to say the least i know they make some noise but it does sound as if its being throttled by big hands. the ball is new and grease free, the indicator is pointing between + and - so half way. could this be a touch of grease when shunted away at the storage site but then we did cover 460 miles from start to finish on our recent trip. Any solutions ? Question 2. As chief cook and bottle washer on our recent trip i noticed the sink water was slow in running away is this normal ?. As this is a twin axle with the outlet connections at the back my sinkunblockerwireything wont go sink to back so can i use a liquid solution such as Mrmuscle sink unblocker or is there a caravan version ?.