Black Marks on Pontoons

[NonVoting Taxpayer]

I own a Pontoon Boat. I have black marks on my Pontoons left from the ropes I used to tie down the cover this winter. I have tried four or five different cleaners and waxes to try to get the marks to go away without any sucess. Anyone out there know of any good cleaners or ideas that I can try?

[madrasahs]

I own a Pontoon Boat. I have black marks on my Pontoons left from the ropes I used to tie down the cover this winter. I have tried four or five different cleaners and waxes to try to get the marks to go away without any sucess. Anyone out there know of any good cleaners or ideas that I can try?

I use "Zud" on aluminum, and "Shiela-Shine" on stainless steel. Both are powders, and available at hardware stores. :)

[fatlazyless]

Heinz's white vinegar is good for cleaning stainless steel kitchen sinks, & big aluminum pontoons; makes them 'like new' again!