So I bought my home last year and it had an in ground pool with a low of newer equipment but the multi valve to go from Filter/Backwash/Rinse/etc has become progressively more difficult to move. It is now to the point that it takes both arms and putting body weight into moving this thing. There is a lot of discoloration(algae or dirt I'm assuming) where the handle turns that piece but I'm not sure how I would go about cleaning that or if this would help? Would some form of silicon or lubricant help?