Paintwork under water fill up point

Hi, earlier this year I got Rhino installs to do some work on my van. Including an undercarriage water tank and filler point. I have noticed that there are marks on the paintwork underneath the water filler point. Has anyone else encountered this and how do I fix it? Thanks
 
Something like autoglym rapid renovator..?

Probably a few paintwork restore products available.. might be worth a try...
 
If it's the white scum (calcium carbonate?) that gets left behind when hard tap water is used to wash the van and dries out in the sun before you can dry it off properly with a leather or towel then you can spray a little Limelite or Viakal (and dry off immediately) to the scummed area to dissolve the white deposit.
I get trails from the side windows on my chestnut brown camper where the water dribbles out after I've washed and leathered the vehicle, drives me barmy!
 
Had to look up DI Vessel as I thought for a minute it might be something to do with old mens dribbles and I've got that covered with a triple strength air freshener!:thumbsup:
 
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