Cleaning bare alloy hull ? what to use !

[skipalong]

i have a water mark on my bare alloy hull just wonder what would be used to clean it up ? thanks, i would just do the whole side of the boat (acid)?

[Stik-ugly]

The problem is if you clean just the small area on the hull its going to stand out . Maybe try a very diluted acid wash first

[bigjimg]

Look up the Penetrol products site.They've got some good products that may do the trick.Jim